How do I databind the SelectedItems property? I'm just getting the following compilation error and can't find any examples of how it's done in the documentation

We have an existing WinForms app that we would like to migrate to WPF using your WPF support. The plan was to implement the main app (including docking) in WPF and then embed the existing WinForms controls into it until we get around to rewriting them using WPF. This seems to work reasonably well until we float one of the panes. Then the WinForms control is not rendered. If we dock it back again the control shows up. From what I can tell on the Forums this is/was a known issue. Should this now be possible?

Thanks
Dave Goughnour

Hi

We are looking at using Telerik charts to replace an older WinForms charting widget, and we need to maintain backwards compatibility in order to maintain the correct look and feel.  Our previous charting widgets heavily supported 3D charting, but Telerik's 3D charts are not particularly similar in visual style to the ones we are looking to replace.  I have been looking at ChartArea, and have noticed that there is a Template3D that is used to dictate how the 3D charts are set up visually, and this would be perfect to use for what we want to do.  In attempting to create a custom style in order to specify our own Template3D, I have been running into a few problems.  Currently, I have a ChartArea style that specifies our custom Template3D, which I have pulled from looking at the default Template3D normally used:


However, when I try to assign this style to the ChartArea of any 3D chart, I get a null reference exception in RadChart.  The call stack gives the last few calls as:
 
Telerik.Windows.Controls.Charting.dll!Telerik.Windows.Controls.Charting.Series3D.ChartArea.get()
Telerik.Windows.Controls.Charting.dll!Telerik.Windows.Controls.Charting.Series3D.LabelsControl.get()
Telerik.Windows.Controls.Charting.dll!Telerik.Windows.Controls.Charting.Series3D.RemoveLabelLayer()

When virtualizing is turned on, a group is collapsed when its out of visible area and expands if it needs to when it returned to the visible area.  I need to display a count of all expanded groups for the user.  How can I get the "actual" expand count from the RadGridView?  Since the RadGridView is auto-expanded when they come back, it obviously knows whatn needs to be expanded.

Is there any means of setting the QueryableEntityCollectionView to a subset of data using a linq query or some other means?

For example the following code will include all recurds in tbUser

I only want active users to be included based on a flag.  It's preferable if the user is blind to this filter in that the column on the grid doesn't show that it's been filtered.

I see that there is another constructer that uses ObjectQuery but I can't get my head around how this works and I can't seem to find any examples.

Any help is appreciated.

Hi Telerik,
 
 I have an mvvm solution. In my viewmodel I have an QueryableCollectionView of the class "BaseClass" objects and an standalone "BaseClass" element(let's call it seletedElem). The "BaseClass" class have a private QueryableCollection of the "ChildClass" objects(let's call it SCollection), and a property that returns this collection. Both classes are implementing the following interfaces:  INotifyPropertyChanged, IDataErrorInfo, IEditableObject. In my view I have raddatagrid which itemssource is binded to the ObservableCollection of "BaseClass" objects from viewmodel and selected item is binded to the standalone "BaseClass" object - selectedElem.

The Dataform is binded to the currently selected grid item in this way :

  ItemsSource="{Binding ElementName=xxx,Path=DataContext.seletedElem.SCollection}"

Then before the first DataGrid's selection changed event, or after the new item is inserted to the grid, when I press add button of the raddataform the current item of the SCollection is always an empty item of type ChildClass, but after the grid's selection changed event(when one of the existing items is selected) the current item of the SCollection is always null and im not able to edit it's properties.

Is there anyway to fix this behaviour?

Regards,
Tomasz

Dear support,

We have the problem that in DayView some entries are out of the visible range.
Instead of scrolling down to see if there are items, we would like to have a mark that shows if there are items that are currently not shown.
Is this feature planned? Or is it possible to implement it by myself?

I have attached an image to clarify my request.

Regards

I have a series of square XY Scatter Charts which all range from +Value to -Value with 0 in the centre in both axis. (I have attached a picture of one of these charts to better illustrate what I mean). 

I need to be able to zoom in on all of these charts at once using a slider bar placed elsewhere on the form. I can easily tie the zoom level of the chart to the slider bar by using: 

chart.Zoom = new Size(zoomSlider.Value, zoomSlider.Value);

which zooms into both axis at the same rate. However by default this seems to zoom in to left most point on the X axis and the top most point on the Y. The behaviour I need is to zoom into the centre of each chart so that point 0, 0 is always at the centre (The two charts in the picture illustrate this. The Zoom/Pan bars are only there to illustrate what I mean and will not be there in the final product).

I'm fairly certain that I need to use PanOffset to achieve this but I am unsure how to calculate the point to pass to it. 

Any help would be appreciated. 

Thanks, 

Andy.

Hello,

I'm creating a custom ScatterLineSeries to simulate annotations in his own series. For this, I am register the load event of the series and look for the first canvas (serie.FindChildByType<Canvas>()) to add elements.
How do I calculate the coordinates corresponding to a DataPoint on canvas?

Thanks

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