We just got the latest beta release 2009.3.1023.35 and we are getting a NullReferenceException exception while the grid attempts to apply a header template.

 System.NullReferenceException was unhandled
  Message="Object reference not set to an instance of an object."
  Source="Telerik.Windows.Controls.GridView"
  StackTrace:
       at Telerik.Windows.Controls.GridView.GridViewHeaderCell.OnApplyTemplate() in c:\Builds\WPF_Scrum\GridView_WPF\Sources\Development\Controls\GridView\GridView\GridView\Cells\GridViewHeaderCell.cs:line 515
       at System.Windows.FrameworkElement.ApplyTemplate()
       at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
       at System.Windows.UIElement.Measure(Size availableSize)
       at Telerik.Windows.Controls.GridView.GridViewCellsPanel.MeasureChild(UIElement child, Size constraint) in c:\Builds\WPF_Scrum\GridView_WPF\Sources\Development\Controls\GridView\GridView\GridView\Virtualization\GridViewCellsPanel.cs:line 485
       at Telerik.Windows.Controls.GridView.GridViewCellsPanel.GenerateChild(IItemContainerGenerator generator, Size constraint, GridViewColumn column, Int32& childIndex, Size& childSize) in c:\Builds\WPF_Scrum\GridView_WPF\Sources\Development\Controls\GridView\GridView\GridView\Virtualization\GridViewCellsPanel.cs:line 1015
       at Telerik.Windows.Controls.GridView.GridViewCellsPanel.EnsureAtleastOneHeader(IItemContainerGenerator generator, Size constraint, List`1 realizedColumnIndices, List`1 realizedColumnDisplayIndices) in c:\Builds\WPF_Scrum\GridView_WPF\Sources\Development\Controls\GridView\GridView\GridView\Virtualization\GridViewCellsPanel.cs:line 831
       at Telerik.Windows.Controls.GridView.GridViewCellsPanel.DetermineRealizedColumnsBlockList(Size constraint) in c:\Builds\WPF_Scrum\GridView_WPF\Sources\Development\Controls\GridView\GridView\GridView\Virtualization\GridViewCellsPanel.cs:line 786
       at Telerik.Windows.Controls.GridView.GridViewCellsPanel.MeasureOverride(Size constraint) in c:\Builds\WPF_Scrum\GridView_WPF\Sources\Development\Controls\GridView\GridView\GridView\Virtualization\GridViewCellsPanel.cs:line 438
       at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
       at System.Windows.UIElement.Measure(Size availableSize)
       at MS.Internal.Helper.MeasureElementWithSingleChild(UIElement element, Size constraint)
       at System.Windows.Controls.ItemsPresenter.MeasureOverride(Size constraint)
       at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
       at System.Windows.UIElement.Measure(Size availableSize)
       at System.Windows.Controls.Grid.MeasureOverride(Size constraint)
       at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
       at System.Windows.UIElement.Measure(Size availableSize)
       at System.Windows.Controls.Control.MeasureOverride(Size constraint)
       at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
       at System.Windows.UIElement.Measure(Size availableSize)
       at System.Windows.Controls.Grid.MeasureCell(Int32 cell, Boolean forceInfinityV)
       at System.Windows.Controls.Grid.MeasureCellsGroup(Int32 cellsHead, Size referenceSize, Boolean ignoreDesiredSizeU, Boolean forceInfinityV)
       at System.Windows.Controls.Grid.MeasureOverride(Size constraint)
       at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
       at System.Windows.UIElement.Measure(Size availableSize)
       at System.Windows.Controls.Border.MeasureOverride(Size constraint)
       at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
       at System.Windows.UIElement.Measure(Size availableSize)
       at System.Windows.Controls.Control.MeasureOverride(Size constraint)
       at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
       at System.Windows.UIElement.Measure(Size availableSize)
       at System.Windows.Controls.Grid.MeasureCell(Int32 cell, Boolean forceInfinityV)
       at System.Windows.Controls.Grid.MeasureCellsGroup(Int32 cellsHead, Size referenceSize, Boolean ignoreDesiredSizeU, Boolean forceInfinityV)
       at System.Windows.Controls.Grid.MeasureOverride(Size constraint)
       at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
       at System.Windows.UIElement.Measure(Size availableSize)
       at System.Windows.Controls.ScrollViewer.MeasureOverride(Size constraint)
       at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
       at System.Windows.UIElement.Measure(Size availableSize)
       at System.Windows.Controls.Grid.MeasureCell(Int32 cell, Boolean forceInfinityV)
       at System.Windows.Controls.Grid.MeasureCellsGroup(Int32 cellsHead, Size referenceSize, Boolean ignoreDesiredSizeU, Boolean forceInfinityV)
       at System.Windows.Controls.Grid.MeasureOverride(Size constraint)
       at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
       at System.Windows.UIElement.Measure(Size availableSize)
       at System.Windows.Controls.Grid.MeasureOverride(Size constraint)
       at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
       at System.Windows.UIElement.Measure(Size availableSize)
       at System.Windows.Controls.Border.MeasureOverride(Size constraint)
       at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
       at System.Windows.UIElement.Measure(Size availableSize)
       at System.Windows.Controls.Decorator.MeasureOverride(Size constraint)
       at System.Windows.Documents.AdornerDecorator.MeasureOverride(Size constraint)
       at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
       at System.Windows.UIElement.Measure(Size availableSize)
       at System.Windows.Controls.Control.MeasureOverride(Size constraint)
       at Telerik.Windows.Controls.GridView.GridViewDataControl.MeasureOverride(Size constraint) in c:\Builds\WPF_Scrum\GridView_WPF\Sources\Development\Controls\GridView\GridView\GridView\GridViewDataControl.cs:line 5772
       at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
       at System.Windows.UIElement.Measure(Size availableSize)
       at System.Windows.Controls.DockPanel.MeasureOverride(Size constraint)
       at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
       at System.Windows.UIElement.Measure(Size availableSize)
       at MS.Internal.Helper.MeasureElementWithSingleChild(UIElement element, Size constraint)
       at System.Windows.Controls.ContentPresenter.MeasureOverride(Size constraint)
       at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
       at System.Windows.UIElement.Measure(Size availableSize)
       at System.Windows.Controls.Border.MeasureOverride(Size constraint)
       at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
       at System.Windows.UIElement.Measure(Size availableSize)
       at System.Windows.Controls.Control.MeasureOverride(Size constraint)
       at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
       at System.Windows.UIElement.Measure(Size availableSize)
       at System.Windows.Controls.Grid.MeasureOverride(Size constraint)
       at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
       at System.Windows.UIElement.Measure(Size availableSize)
       at MS.Internal.Helper.MeasureElementWithSingleChild(UIElement element, Size constraint)
       at System.Windows.Controls.ContentPresenter.MeasureOverride(Size constraint)
       at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
       at System.Windows.UIElement.Measure(Size availableSize)
       at System.Windows.Controls.Border.MeasureOverride(Size constraint)
       at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
       at System.Windows.UIElement.Measure(Size availableSize)
       at System.Windows.Controls.Control.MeasureOverride(Size constraint)
       at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
       at System.Windows.UIElement.Measure(Size availableSize)
       at MS.Internal.Helper.MeasureElementWithSingleChild(UIElement element, Size constraint)
       at System.Windows.Controls.ContentPresenter.MeasureOverride(Size constraint)
       at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
       at System.Windows.UIElement.Measure(Size availableSize)
       at System.Windows.Controls.Control.MeasureOverride(Size constraint)
       at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
       at System.Windows.UIElement.Measure(Size availableSize)
       at MS.Internal.Helper.MeasureElementWithSingleChild(UIElement element, Size constraint)
       at System.Windows.Controls.ContentPresenter.MeasureOverride(Size constraint)
       at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
       at System.Windows.UIElement.Measure(Size availableSize)
       at System.Windows.Controls.Grid.MeasureCell(Int32 cell, Boolean forceInfinityV)
       at System.Windows.Controls.Grid.MeasureCellsGroup(Int32 cellsHead, Size referenceSize, Boolean ignoreDesiredSizeU, Boolean forceInfinityV)
       at System.Windows.Controls.Grid.MeasureOverride(Size constraint)
       at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
       at System.Windows.UIElement.Measure(Size availableSize)
       at System.Windows.Controls.Border.MeasureOverride(Size constraint)
       at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
       at System.Windows.UIElement.Measure(Size availableSize)
       at System.Windows.Controls.Grid.MeasureCell(Int32 cell, Boolean forceInfinityV)
       at System.Windows.Controls.Grid.MeasureCellsGroup(Int32 cellsHead, Size referenceSize, Boolean ignoreDesiredSizeU, Boolean forceInfinityV)
       at System.Windows.Controls.Grid.MeasureOverride(Size constraint)
       at System.Windows.FrameworkElement.MeasureCore(Size availableSize)
       at System.Windows.UIElement.Measure(Size availableSize)
       at System.Windows.ContextLayoutManager.UpdateLayout()
       at System.Windows.ContextLayoutManager.UpdateLayoutCallback(Object arg)
       at System.Windows.Media.MediaContext.InvokeOnRenderCallback.DoWork()
       at System.Windows.Media.MediaContext.FireInvokeOnRenderCallbacks()
       at System.Windows.Media.MediaContext.RenderMessageHandlerCore(Object resizedCompositionTarget)
       at System.Windows.Media.MediaContext.AnimatedRenderMessageHandler(Object resizedCompositionTarget)
       at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Boolean isSingleParameter)
       at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Boolean isSingleParameter, Delegate catchHandler)
       at System.Windows.Threading.Dispatcher.WrappedInvoke(Delegate callback, Object args, Boolean isSingleParameter, Delegate catchHandler)
       at System.Windows.Threading.DispatcherOperation.InvokeImpl()
       at System.Windows.Threading.DispatcherOperation.InvokeInSecurityContext(Object state)
       at System.Threading.ExecutionContext.runTryCode(Object userData)
       at System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode code, CleanupCode backoutCode, Object userData)
       at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Windows.Threading.DispatcherOperation.Invoke()
       at System.Windows.Threading.Dispatcher.ProcessQueue()
       at System.Windows.Threading.Dispatcher.WndProcHook(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
       at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
       at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
       at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Boolean isSingleParameter)
       at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Boolean isSingleParameter, Delegate catchHandler)
       at System.Windows.Threading.Dispatcher.WrappedInvoke(Delegate callback, Object args, Boolean isSingleParameter, Delegate catchHandler)
       at System.Windows.Threading.Dispatcher.InvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Boolean isSingleParameter)
       at System.Windows.Threading.Dispatcher.Invoke(DispatcherPriority priority, Delegate method, Object arg)
       at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
       at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)
       at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
       at System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame)
       at System.Windows.Threading.Dispatcher.Run()
       at System.Windows.Application.RunDispatcher(Object ignore)
       at System.Windows.Application.RunInternal(Window window)
       at System.Windows.Application.Run(Window window)
       at System.Windows.Application.Run()
       at Iti.Ccs.Shell.App.Main() in C:\Users\arodriguez.EN3SOFTWARE\ITI.CCS.AR20091014\Source\Iti.Ccs.Shell\obj\Debug\App.g.cs:line 0
       at System.AppDomain._nExecuteAssembly(Assembly assembly, String[] args)
       at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
       at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
       at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Threading.ThreadHelper.ThreadStart()
  InnerException:

I have used radgridview with celltemplate for column. I am not able to call  RowEditEnded or  CellEditEnded eventhandler on click of cell to edit the cell value. If I removed celltemplate used for binding, then it is working fine and corresponding celledittemplate is displaying and RowEditEnded or  CellEditEnded event handler is also invoking.But, if I am putting both inside GridViewDataColumn tag, it is not working. I am putting my code below for reference.



  <telerik:GridViewDataColumn DataMemberBinding="{Binding Path=FirstName}">
                 <telerik:GridViewColumn.CellTemplate>
                        <DataTemplate>
                            <TextBox BorderThickness="0" Text= "{Binding FirstName}" Foreground="#0066cc"   Width="100" TextAlignment="Center" />
                        </DataTemplate>
                    </telerik:GridViewColumn.CellTemplate>
                    <telerik:GridViewColumn.CellEditTemplate>
                        <DataTemplate>
                            <TextBox BorderThickness="0" Text= "{Binding FirstName,Mode=TwoWay}" Foreground="#0066cc"   Width="100" TextAlignment="Center" />
                        </DataTemplate>
                    </telerik:GridViewColumn.CellEditTemplate>
                </telerik:GridViewDataColumn>

Please help me in that. I just want to call RowEditEnded or  CellEditEnded  method on click of cell for editing purpose. But that cell using celltemplate. It is very very urgent.

In WPF, WindowsFormsHost control will always draws ontop of everything in the same WPF window.
In docking, this problem happens when the floating panes move over the Pane that contain WindowsFormsHost Control.
But, if the floating panes are the separate WPF window, this problem will be solved.

Would you consider to change the design so that the floating panes can draw ontop of the WindowsFormsHost Control?
I think many of us need this a lot when doing migration.

Thanks.

Hi

I'm looking for an example of binding an observable collection to a radChart in xaml.

This is an app i'm playing around with and it supplies its data to the view using the MVVM pattern.  For the life of me i cannot find an example of how to do this.  Any example i come across has data hard coded into the xaml which i find really annoying - why not use northwind/adventureworks to show these examples?

I have a observable collection with products and quantities all i want to do is show the quantities for each product on a chart.  This will work if i just bind the itemsource of the chart to the observable collection.  but i want to show the product name along the x-axis and also in the legend.

Can anyone give me an example?

Nice controls by the way - just finding it hard to find info in how to use them in MVVM app.

It would be nice if you could have examples that pulled data from a database i.e. Nortwind/adventureworks this would surely help a lot of beginners like myself.

Thanks
Paul 

When I look at all of the WPF examples I see the XAML pages, but when i click to see C# pages nothing happens... Both in
IE 8.0.6001.18828
and
Firefox
3.0.8

Thanks !

Hi,

Is there any way to bind to the CheckState of an Item in the TreeView?

Cheers

Justin Taylor

is there a way to remove the scroll bars on a combox dropdown.  I just want the dropdown to be large enough for all the items.  I only have 1 or 2 too many items, and would rather have a larger dropdown then have scroll bars

Hi,

I would like to do some basic customizations to the Telerik GridView. I am using the Office_Silver theme  

1. Remove all gridlines from the Telerik GridView - including the column headers

2. Set the highlight color for the row

3. Customize the alternating background color
          Already done using the AlternateRowStyle property on RadGridView

Can someone please advise me how I can make these customizations

Thanks
Namir


            

Hi.
I have TreeView like:
A
  AA
  AA
B
  BB
  BB
C
  CC
  ...
Drag/drop is only allowed inside of its group. Ex: AA can be moved anywhere inside A group, BB can be moved anywhere inside B group. Initialy i was stopping drop using previewDragEnded. It worked only in situations when drop position was "inside". If drop position was "after" or "before" RadTreeViewDragEndedEventArgs e.TargetDropItem was always null even though if I check TreeView.TargetDropItem was set correctly (I guess it is a bug? ). I couldnt check it cause TreeView.TargetDropItem is not accesible from code.
My current approach is traverse the tree and set IsDropAllowed property on every item. The problem here are elements whose drop position is "after" or "before" which I try to drop after or before root elements (A, B, C). These root elements doesn't have parent elemnent so I don't see any way to set there IsDropAllowed . So behaviour I have now is: after I drag AA after B I got:
B
   BB
   BB
   AA
I thought about adding additional root element and add current root elements to him but in this case I would have to hide (don't display) the new root element otherwise I would have the same problem as before.

Any help or suggestions would be appreciated.

Best Regards,
Jarek (Xiasma)

I am trying to wire-up a click event to a checkbox column inside the RadGridview.  My problem is that when I handle the click event of the check box the grid has not registered the selected item yet, so I can't access the record to obtain the value from another column for the record which was checked.  Here is the click event code:


The SelectedItem property is null.  So I need to handle the click event after the grid has processed the click.  Just not quite sure yet how to do this.

Thanks,
-SId.