Search found 61 matches

by jrvdboom
Wed Jun 01, 2016 7:28 am
Forum: LightningChart Feature Requests
Topic: Vertical constant lines
Replies: 3
Views: 23212

Re: Vertical constant lines

No, still using a LineSeriesCursor as a workaround.
by jrvdboom
Tue Apr 19, 2016 6:54 am
Forum: LightningChart Ultimate WPF
Topic: AutoFormatLabels rounding error
Replies: 2
Views: 7560

Re: AutoFormatLabels rounding error

Verified and OK!
by jrvdboom
Fri Apr 15, 2016 11:23 am
Forum: LightningChart Ultimate WPF
Topic: AutoFormatLabels rounding error
Replies: 2
Views: 7560

AutoFormatLabels rounding error

Hi guys, We have a problem with the AutoFormatLabels of an axis. This screenshot says it all actually: lc7.png The first 1 on the X axis should have been displayed as 0.5 of course. We detected this in 6.5.5, but confirmed it's still present in both 6.5.8 and 7.0.2. We have a workaround in place wit...
by jrvdboom
Tue Dec 08, 2015 2:18 pm
Forum: LightningChart Ultimate WPF
Topic: Print in bitmap mode gives empty page
Replies: 2
Views: 6376

Re: Print in bitmap mode gives empty page

Yep, I was using 6.5.3. Upgrading to 6.5.5 solved it.

Thank you!!
by jrvdboom
Tue Dec 08, 2015 11:28 am
Forum: LightningChart Ultimate WPF
Topic: Print in bitmap mode gives empty page
Replies: 2
Views: 6376

Print in bitmap mode gives empty page

I use the LightningChart.PrintPreview method to show a print preview dialog. It gives me the choice to print the content as Bitmap or Vector. When I select Vector the print is fine. When I select Bitmap however, the printer gives me an empty page. I tried the same with the Demo application but there...
by jrvdboom
Fri Sep 11, 2015 10:07 am
Forum: LightningChart Ultimate WPF
Topic: Empty chart until active view has changed
Replies: 1
Views: 4404

Empty chart until active view has changed

One of our customers has some strange behavior. When the chart is loaded, no datapoints are shown. The axes, grid, etc. are drawn fine. Axes are even showing the correct range for the data that was loaded. When he switches to 3D view, the datapoints appear all of a sudden, also when he switches back...
by jrvdboom
Fri Sep 04, 2015 9:44 am
Forum: LightningChart Bug Reports
Topic: Logarithmic Y axis labels and title
Replies: 4
Views: 24715

Re: Logarithmic Y axis labels and title

These are nice workarounds, but the fact remains that AutoMargins should work properly for ALL ScaleTypes, ALL LogLabelsTypes and ALL LabelNumberFormats.
So please fix it in a (hopefully no too distant) future version.

Thanks,
Joost
by jrvdboom
Wed Sep 02, 2015 6:33 am
Forum: LightningChart Bug Reports
Topic: Logarithmic Y axis labels and title
Replies: 4
Views: 24715

Re: Logarithmic Y axis labels and title

I think you might have misunderstood me. When I set LabelsNumberFormat to string.Empty the formatting is exactly what I want it to be, so there's no need to use the event handler. My problem is that the left margin is calculated incorrectly. Of course I can adjust the margin manually, but I expect A...
by jrvdboom
Fri Aug 28, 2015 1:05 pm
Forum: LightningChart Bug Reports
Topic: Logarithmic Y axis labels and title
Replies: 4
Views: 24715

Logarithmic Y axis labels and title

Hi, I have a logarithmic Y axis with values smaller than 1. I have AutoFormatLabels set to true. It looks like this: yaxis1.png I don't want the 0.0 values. I thought AutoFormatLabels would take care of this, but it doesn't. Instead I have to change the LabelsNumberFormat. When I set "" (e...
by jrvdboom
Tue Aug 25, 2015 12:22 pm
Forum: LightningChart Ultimate WPF
Topic: FlowDirection.RightToLeft
Replies: 1
Views: 5103

FlowDirection.RightToLeft

When I set FlowDirection to RightToLeft, zooming, panning and dragging axes doesn't work correctly anymore. I can of course explicitly set FlowDirection to LefttoRight for only the chart control, but it would be nice if it would also work correctly when FlowDirection is inherited from the Window. Th...
by jrvdboom
Thu Aug 20, 2015 7:29 am
Forum: LightningChart Ultimate WPF
Topic: LineSeriesCursor bug?
Replies: 5
Views: 11092

LineSeriesCursor bug?

This is something that is happening since version 6.5.1, it was still okay in version 6.4.4: When I have a chart with a line series cursor and I pan the chart, the cursor moves along as it should. But once I have moved the line series cursor with the mouse, it stays on the exact same spot when panni...
by jrvdboom
Fri Jun 26, 2015 11:06 am
Forum: LightningChart Ultimate WPF
Topic: Zero is not zero
Replies: 2
Views: 9402

Re: Zero is not zero

It's definitely double inaccuracy, but caused by the fact that the labels are calculated from one side of the axis to the other. If you start labelling a 0, zero would actually be 0 no matter the zoom level/padding. Another solution might determine the step value between the labels (you probably alr...
by jrvdboom
Thu Jun 25, 2015 1:44 pm
Forum: LightningChart Ultimate WPF
Topic: Zero is not zero
Replies: 2
Views: 9402

Zero is not zero

Sometimes an axis doesn't show zero where it should. See Y axis in the attachment. Reproducable by zooming in and panning around a little.
by jrvdboom
Wed May 27, 2015 2:22 pm
Forum: LightningChart Ultimate WPF
Topic: LogAbs scale type
Replies: 1
Views: 4233

LogAbs scale type

The only available scale types for X/Y axes are Linear and Logarithmic. When using Logarithmic scale type, values below the LogZeroClamp are clipped. What I would like to have is a LogAbs scale type, where negative values are drawn positive. I could of course create my series with absolute values, b...
by jrvdboom
Tue May 26, 2015 7:47 am
Forum: LightningChart Feature Requests
Topic: Draw every n-th point
Replies: 0
Views: 17716

Draw every n-th point

When a PointLineSeries is drawn with both the line and points visible and you have many points in the dataset, the line is hidden by all the points. It would be nice to be able to draw only every n-th point (e.g. 1 out of every 100 points). The line (of course) draws all points.

Thanks,
Joost
by jrvdboom
Tue May 26, 2015 7:25 am
Forum: LightningChart Feature Requests
Topic: AreaSeries with negative area
Replies: 3
Views: 19243

Re: AreaSeries with negative area

As a workaround I tried using a PolygonSeries, but it doesn't get filled right when vertices cross each other. So please, can you improve the AreaSeries???
by jrvdboom
Thu May 21, 2015 1:03 pm
Forum: LightningChart Feature Requests
Topic: AreaSeries with negative area
Replies: 3
Views: 19243

Re: AreaSeries with negative area

I knew you were going to say that. I already tried that and it doesn't always work. It works when there's a data point exactly at the base line, like this: correct.png But it doesn't work when the data points skip the base line: wrong.png A true area chart would have drawn a line crossing the base l...
by jrvdboom
Thu May 21, 2015 10:18 am
Forum: LightningChart Feature Requests
Topic: AreaSeries with negative area
Replies: 3
Views: 19243

AreaSeries with negative area

I have an AreaSeries where some data points are above the BaseValue, but some data points are below the BaseValue. I expected that a "negative" area would be drawn for those points, but instead a horizontal line at the BaseValue is drawn. Can you add the functionality to draw negative area...
by jrvdboom
Mon May 18, 2015 10:33 am
Forum: LightningChart Bug Reports
Topic: Y axis scaling in export
Replies: 2
Views: 11583

Re: Y axis scaling in export

I have the latest version. I just sent you a .zip file with the example.

Thanks,
Joost
by jrvdboom
Mon May 18, 2015 8:33 am
Forum: LightningChart Bug Reports
Topic: Y axis scaling in export
Replies: 2
Views: 11583

Y axis scaling in export

When I save my chart to file and I give the export a different size than the default one, the Y axis isn't scaled properly. The X axis works fine. See screenshots:
by jrvdboom
Thu May 07, 2015 9:39 am
Forum: LightningChart Bug Reports
Topic: SeriesEventMarker bug
Replies: 1
Views: 9235

SeriesEventMarker bug

I use a SeriesEventMarker to track values of a PointLineSeries. When I set PointLineSeries.LineVisible = false, the marker disappears. This is my XAML; <Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"...
by jrvdboom
Wed May 06, 2015 10:09 am
Forum: LightningChart Ultimate WPF
Topic: Annotation Arrow sizing.
Replies: 2
Views: 6183

Re: Annotation Arrow sizing.

Vote up! I would also like to be able to change arrow head size independently from line width.
by jrvdboom
Thu Apr 30, 2015 12:47 pm
Forum: LightningChart Ultimate WPF
Topic: Disable zooming and panning
Replies: 2
Views: 5226

Re: Disable zooming and panning

Okay. But now I can still pan and zoom by dragging the axes/scale nibs. Of course I can disable these a well, but I was looking for a simpler solution...
by jrvdboom
Thu Apr 30, 2015 8:31 am
Forum: LightningChart Ultimate WPF
Topic: Disable zooming and panning
Replies: 2
Views: 5226

Disable zooming and panning

Is there a simple way to disable all zooming and panning by the user, while keeping other mouse interactions (highlights, moving cursors, adjusting bands, etc.) enabled?

Thanks,
Joost
by jrvdboom
Wed Apr 22, 2015 6:35 am
Forum: LightningChart Bug Reports
Topic: Double highlight in legenbox
Replies: 3
Views: 11236

Re: Double highlight in legenbox

Thank you!
by jrvdboom
Tue Apr 21, 2015 8:46 am
Forum: LightningChart Ultimate WPF
Topic: Manual axis layout and automatic margins?
Replies: 3
Views: 7031

Re: Manual axis layout and automatic margins?

If AutoAdjustMargins is enabled, YAxisAutoPlacement adjusts the margins. By setting YAxisAutoPlacement = AllLeft, AllRight, LeftThenRight, RightThenLeft, it adjusts the margins based on the axis labels, ticks and titles. When setting YAxisAutoPlacement = Off, ViewXY.Margins.Left and Right applies. ...
by jrvdboom
Mon Apr 20, 2015 11:24 am
Forum: LightningChart Ultimate WPF
Topic: Manual axis layout and automatic margins?
Replies: 3
Views: 7031

Manual axis layout and automatic margins?

When I set automatic Y axis layout to Off, the margins aren't updated automatically anymore.
Is there a workaround for this?

Thanks,
Joost
by jrvdboom
Mon Apr 20, 2015 9:38 am
Forum: LightningChart Bug Reports
Topic: Double highlight in legenbox
Replies: 3
Views: 11236

Double highlight in legenbox

I have a LegendBoxXY in my ViewXY and I've set it to vertical layout. When I hover over the series names, the series get highlighted. However, when I do either this chart.ChartRenderOptions.FontsQuality = FontsRenderingQuality.High; or this chart.ViewXY.LegendBox.SeriesTitleFont = new WPFFont("...
by jrvdboom
Wed Apr 15, 2015 7:19 am
Forum: LightningChart Ultimate WPF
Topic: MouseClick event for graph background
Replies: 1
Views: 4767

MouseClick event for graph background

I can detect clicks on axes, titles, series, etc. through their MouseClick events. But how can I handle events where the user clicks the graph background?
by jrvdboom
Wed Apr 15, 2015 7:17 am
Forum: LightningChart Ultimate WPF
Topic: Multiple charts and multiple UI threads
Replies: 3
Views: 30345

Re: Multiple charts and multiple UI threads

Supposedly multithreaded UI is also possible in the same window by using the HostVisual class. The only drawback is that you lose interaction with the chart. Perhaps you can create an example for that as well?
by jrvdboom
Mon Apr 13, 2015 10:20 am
Forum: LightningChart Ultimate WPF
Topic: Begin/EndUpdate when using data binding?
Replies: 2
Views: 5743

Re: Begin/EndUpdate when using data binding?

I found a solution that fulfills most of my needs regarding begin/end update and data binding: chart.BeginUpdate(); <perform update(s) on view model(s)> chart.Dispatcher.BeginInvoke(new Action(() => chart.EndUpdate()), DispatcherPriority.Render); This works because the DataBind phase is executed wit...
by jrvdboom
Thu Apr 09, 2015 2:20 pm
Forum: LightningChart Ultimate WPF
Topic: 3D line highlight from legend
Replies: 1
Views: 3870

3D line highlight from legend

I'm using PointLineSeries3D where only the line is visible. When I mouse over the line, it highlights. However, when I hover over the series title in the legend, the line is not highlighted. When I show both the line and points, the points do get highlighted.

Bug or feature?

Cheers,
Joost
by jrvdboom
Thu Jan 29, 2015 7:48 am
Forum: LightningChart Bug Reports
Topic: Chart with annotations in TabControl
Replies: 4
Views: 11033

Re: Chart with annotations in TabControl

Problem solved!
Thank you!
by jrvdboom
Tue Jan 20, 2015 2:54 pm
Forum: LightningChart Ultimate How-To's
Topic: Show origin
Replies: 1
Views: 7168

Show origin

I would like to highlight the origin of the chart, e.g. a horizontal line at Y=0 and a vertical line at X=0. How would I do that?

Thanks,
Joost
by jrvdboom
Tue Jan 20, 2015 12:35 pm
Forum: LightningChart Bug Reports
Topic: Chart with annotations in TabControl
Replies: 4
Views: 11033

Re: Chart with annotations in TabControl

I'm using an on-board Intel HD Graphics 4000.
by jrvdboom
Tue Jan 20, 2015 10:49 am
Forum: LightningChart Bug Reports
Topic: Chart with annotations in TabControl
Replies: 4
Views: 11033

Chart with annotations in TabControl

I use LightningChart within a TabControl. It's not visible until the user selects the tab that contains the chart. This worked fine, until I added an annotation to the chart. Please try this example: <Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="ht...
by jrvdboom
Fri Dec 05, 2014 3:59 pm
Forum: LightningChart Ultimate WPF
Topic: LicenseException
Replies: 15
Views: 49654

Re: LicenseException

We tried to reproduce our problem in a sample VS project, but were unable to. We do see in the debugger that the LicenseExceptions are thrown, but they're also caught by the LightningChartUltimate.GHC() method. In our production code (which is not suitable to send by e-mail) we see that LightningCha...
by jrvdboom
Thu Dec 04, 2014 8:51 am
Forum: LightningChart Ultimate WPF
Topic: LicenseException
Replies: 15
Views: 49654

Re: LicenseException

We checked the dll's and we also completely clean/rebuild the solutions, but the exception remains.
Any other suggestions?
by jrvdboom
Wed Dec 03, 2014 2:30 pm
Forum: LightningChart Ultimate WPF
Topic: LicenseException
Replies: 15
Views: 49654

LicenseException

My colleague and I are working on the same project. I'm responsible for the UI, so I'm the only one with a license. Today I updated from version 6.1.1 to 6.2.6 and all of a sudden my colleague get an exception: System.ComponentModel.LicenseException occurred _HResult=-2146232063 _message=No key avai...
by jrvdboom
Fri Oct 24, 2014 12:09 pm
Forum: LightningChart Bug Reports
Topic: NullRefExc when setting SeriesBase3D.XAxisBinding in XAML
Replies: 5
Views: 14676

Re: NullRefExc when setting SeriesBase3D.XAxisBinding in XAM

Here's my code: <Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:lcu="http://www.arction.com/schemas/" x:Class="LightningTest.MainWindow" Title="MainWindow" Height=...
by jrvdboom
Fri Oct 24, 2014 12:06 pm
Forum: LightningChart Bug Reports
Topic: NullRefExc when setting SeriesBase3D.XAxisBinding in XAML
Replies: 5
Views: 14676

Re: NullRefExc when setting SeriesBase3D.XAxisBinding in XAM

I'm sorry for leaving this important bit of info out: it only excepts when you set it to Secondary.
Currently I'm using version 6.1.1.

Thanks,
Joost
by jrvdboom
Wed Oct 22, 2014 12:38 pm
Forum: LightningChart Ultimate WPF
Topic: Fuzzy graphics with high DPI
Replies: 6
Views: 13934

Re: Fuzzy graphics with high DPI

Let me guess: you create a D3D back buffer with LightningChartUltimate.ActualWidth and LightningChartUltimate.ActualHeight for the size. You then render the back buffer on a D3DImage with default DPI settings of 96. That would explain the fuzziness. ActualWidth and ActualHeight are device independen...
by jrvdboom
Wed Oct 22, 2014 10:00 am
Forum: LightningChart Ultimate WPF
Topic: Fuzzy graphics with high DPI
Replies: 6
Views: 13934

Fuzzy graphics with high DPI

If I set my display to 120 DPI it seems that the chart is rendered at 96 DPI and then scaled by 125%. The output gets very fuzzy (for lines, text, etc.) or looks low-res (for 3D objects). Is there a property I can set to turn of this scaling, so that everything will look nice and crisp again? Thanks...
by jrvdboom
Tue Oct 21, 2014 11:59 am
Forum: LightningChart Bug Reports
Topic: NullRefExc when setting SeriesBase3D.XAxisBinding in XAML
Replies: 5
Views: 14676

NullRefExc when setting SeriesBase3D.XAxisBinding in XAML

When I set the SeriesBase3D.XAxisBinding (or Y or Z axis binding) in XAML, I get a NullReferenceException because the series isn't coupled to the View3D yet.

Thank you for fixing,
Joost
by jrvdboom
Fri Sep 26, 2014 12:34 pm
Forum: LightningChart Ultimate WPF
Topic: Font problems
Replies: 1
Views: 4719

Re: Font problems

OK, problem 1 seems to disappear when I set TitleBase.Font = new WPFFont();
by jrvdboom
Fri Sep 26, 2014 10:03 am
Forum: LightningChart Ultimate WPF
Topic: Font problems
Replies: 1
Views: 4719

Font problems

I have two problems with the fonts of my titles:
1) It seems that setting the FontFamily doesn't work, no matter what I font family I set, the title is rendered the same.
2) When the FontSize is increased, the title is not resized and some characters will fall off.

Please help!

Thanks,
Joost
by jrvdboom
Mon Sep 15, 2014 10:14 am
Forum: LightningChart Ultimate WPF
Topic: ZoomPanOptions with AspectRatio
Replies: 4
Views: 9632

Re: ZoomPanOptions with AspectRatio

You're right, min and max won't do. But what about the RangeRevertMinimum and RangeRevertMaximum, because those are the min and max I set in my custom logic. I also have ZoomPanOptions.RightToLeftZoomAction set to RevertAxisRanges.
by jrvdboom
Mon Sep 15, 2014 9:45 am
Forum: LightningChart Ultimate WPF
Topic: ZoomPanOptions with AspectRatio
Replies: 4
Views: 9632

Re: ZoomPanOptions with AspectRatio

The I would like to propose an extension of the design (maybe through an extra setting): When the min and max of the axes are explicitly set: - if aspect ratio of axes > aspect ratio of graph, then Y is set by X - if aspect ratio of axes < aspect ratio of graph, the X is set by Y (where aspect ratio...
by jrvdboom
Tue Sep 09, 2014 9:45 am
Forum: LightningChart Ultimate WPF
Topic: ZoomPanOptions with AspectRatio
Replies: 4
Views: 9632

ZoomPanOptions with AspectRatio

I wrote my own routine to scale the axes of a series, so I also have margins for the X axis. Works fine: noaspect.png Now I need the show the same series with an aspect ratio of 1. The calculated axes ranges are the same as for the picture above, but now the series is shown like this: aspectwrong.pn...
by jrvdboom
Wed Sep 03, 2014 8:11 am
Forum: LightningChart Ultimate WinForms
Topic: Color1, Color2, Color3, GradientFill - SeriesEventMarker
Replies: 5
Views: 12022

Re: Color1, Color2, Color3, GradientFill - SeriesEventMarker

Hi Pasi, I would also like proper borders for all point shapes. I'm not using this for event markers, but for the series as well. Overlapping points now hide each other. I tried using bitmaps as a workaround, but they get scaled in the legend which makes them ugly over there. If the LegendBox would ...
by jrvdboom
Wed Sep 03, 2014 6:53 am
Forum: LightningChart Ultimate WPF
Topic: Begin/EndUpdate when using data binding?
Replies: 2
Views: 5743

Begin/EndUpdate when using data binding?

I'm using data binding to change multiple properties of a chart at the same time. Unfortunately, I see them changing one by one instead of all at once. In code I would have surrounded the changes with BeginUpdate and EndUpdate, but I can't because I'm using data binding. Any suggestions on how to so...
by jrvdboom
Thu Aug 28, 2014 8:58 am
Forum: LightningChart Feature Requests
Topic: Vertical constant lines
Replies: 3
Views: 23212

Vertical constant lines

I would like to have a vertical ConstantLine, with a property like Band.Binding to determine if it should be a horizontal or vertical line.

(I know I could misuse a Cursor to get a vertical constant line, but I like to keep it simple!)

Thanks,
Joost
by jrvdboom
Thu Aug 28, 2014 8:29 am
Forum: LightningChart Bug Reports
Topic: IndexOutOfRangeException when using Bands
Replies: 1
Views: 6666

IndexOutOfRangeException when using Bands

If I add a band to ViewXY.Bands and then call SetSubNodeOwners on the Band, it throws an IndexOutOfRangeException when the axis with the assigned axis index doesn't exist yet. This can easily be prevented by creating the axes before the bands, BUT when working with the Visual Studio designer the gen...
by jrvdboom
Fri Aug 08, 2014 6:52 am
Forum: LightningChart Ultimate WPF
Topic: Text quality
Replies: 2
Views: 8374

Re: Text quality

Hi Pasi, My Intel 3D settings were already to high quality. The light background and font are part of the visual design of our company, so I can't just change that. I played a bit with semi-transparent shadows and it does seem to improve the readability somewhat. If fonts are rendered as textures in...
by jrvdboom
Thu Aug 07, 2014 7:46 am
Forum: LightningChart Ultimate WPF
Topic: OutOfMemoryException
Replies: 2
Views: 6452

Re: OutOfMemoryException

I'm sorry for this VERY late reply, but I totally forgot about this issue (we've been using PointLineSeries so far...).
I tried to reproduce this issue with the latest version, but didn't get the exception anymore. It did get very slow when panning the chart, but no exception.
by jrvdboom
Thu Aug 07, 2014 7:14 am
Forum: LightningChart Ultimate WPF
Topic: Text quality
Replies: 2
Views: 8374

Text quality

Hi,

Is there any way to improve the quality of the text used in the chart (labels, titles, legend, etc.)?
I already set the FontQuality to High and made sure that LayoutRounding was on, but I still find the text rather blurry.
See attachment.

Thanks,
Joost
by jrvdboom
Fri May 16, 2014 8:57 am
Forum: Updating LightningChart from v.5 to v.6
Topic: Distribute DLLs
Replies: 4
Views: 21516

Re: Distribute DLLs

Yes, this works for me as well!
by jrvdboom
Fri May 16, 2014 8:13 am
Forum: Updating LightningChart from v.5 to v.6
Topic: Distribute DLLs
Replies: 4
Views: 21516

Re: Distribute DLLs

I also tried to distribute a sample program to a colleague where LightningChart is not installed. I copied all the mentioned DLLs, but run-time we get a NullReferenceException.

How can we fix this?
by jrvdboom
Mon May 12, 2014 10:02 am
Forum: LightningChart Ultimate WPF
Topic: OutOfMemoryException
Replies: 2
Views: 6452

OutOfMemoryException

In LightningChart 6, I loaded 1 million datapoints and added them to a FreeformPointLineSeries. Drawing them works, but as soons as I try to drag or zoom, I get an OutOfMemoryException with the following stacktrace: at A.K.H(QH[] A) at A.AI.UG(PointFloat[] A, Boolean B, LineStyle C, Boolean F) at A....
by jrvdboom
Mon May 12, 2014 6:24 am
Forum: LightningChart Ultimate WPF
Topic: Lightning Chart 6 and binding to chart dependency properties
Replies: 3
Views: 9560

Re: Lightning Chart 6 and binding to chart dependency proper

It also does work when you bind to a static resource!
by jrvdboom
Fri May 09, 2014 12:32 pm
Forum: LightningChart Ultimate WPF
Topic: Lightning Chart 6 and binding to chart dependency properties
Replies: 3
Views: 9560

Re: Lightning Chart 6 and binding to chart dependency proper

I'm having the same problem. It seems to work only when I create the binding in code:

Binding binding = new Binding("Text");
binding.Source = tb;
BindingOperations.SetBinding(title, TitleBase.TextProperty, binding); // where title is the name of ChartTitle

Cheers,
Joost