I'm getting the following stack trace when I run my app on a brand new Samsung Ativ Windows 8 touch device.

NullReferenceException
at Telerik.Windows.Automation.Peers.GridViewGroupPanelAutomationPeer.GetChildrenCore() in c:\TB\102\WPF_Scrum\Release_WPF\Sources\Development\Controls\GridView\GridView\GridView\Automation\GridViewGroupPanelAutomationPeer.cs:line 44
   at System.Windows.Automation.Peers.AutomationPeer.EnsureChildren()
   at System.Windows.Automation.Peers.AutomationPeer.GetChildren()
   at System.Windows.Automation.Peers.AutomationPeer.isDescendantOf(AutomationPeer parent)
   at System.Windows.Automation.Peers.AutomationPeer.isDescendantOf(AutomationPeer parent)
   at System.Windows.Automation.Peers.AutomationPeer.isDescendantOf(AutomationPeer parent)
   at System.Windows.Automation.Peers.AutomationPeer.isDescendantOf(AutomationPeer parent)
   at System.Windows.Automation.Peers.AutomationPeer.isDescendantOf(AutomationPeer parent)
   at System.Windows.Automation.Peers.AutomationPeer.isDescendantOf(AutomationPeer parent)
   at System.Windows.Automation.Peers.AutomationPeer.isDescendantOf(AutomationPeer parent)
   at System.Windows.Automation.Peers.AutomationPeer.ValidateConnected(AutomationPeer connectedPeer)
   at System.Windows.Automation.Peers.AutomationPeer.AutomationPeerFromInputElement(IInputElement focusedElement)
   at System.Windows.Automation.Peers.AutomationPeer.RaiseFocusChangedEventHelper(IInputElement newFocus)
   at System.Windows.Input.KeyboardDevice.ChangeFocus(DependencyObject focus, Int32 timestamp)
   at System.Windows.Input.KeyboardDevice.TryChangeFocus(DependencyObject newFocus, IKeyboardInputProvider keyboardInputProvider, Boolean askOld, Boolean askNew, Boolean forceToNullIfFailed)
   at System.Windows.Input.KeyboardDevice.Focus(DependencyObject focus, Boolean askOld, Boolean askNew, Boolean forceToNullIfFailed)
   at System.Windows.Input.KeyboardDevice.Focus(IInputElement element)
   at System.Windows.UIElement.Focus()
   at System.Windows.Controls.ListBoxItem.HandleMouseButtonDown(MouseButton mouseButton)
   at System.Windows.Controls.ListBoxItem.OnMouseLeftButtonDown(MouseButtonEventArgs e)
   at System.Windows.UIElement.OnMouseLeftButtonDownThunk(Object sender, MouseButtonEventArgs e)
   at System.Windows.Input.MouseButtonEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget)
   at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
   at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
   at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
   at System.Windows.UIElement.ReRaiseEventAs(DependencyObject sender, RoutedEventArgs args, RoutedEvent newEvent)
   at System.Windows.UIElement.OnMouseDownThunk(Object sender, MouseButtonEventArgs e)
   at System.Windows.Input.MouseButtonEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget)
   at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
   at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
   at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
   at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
   at System.Windows.ContentElement.RaiseTrustedEvent(RoutedEventArgs args)
   at System.Windows.Input.InputManager.ProcessStagingArea()
   at System.Windows.Input.InputManager.ProcessInput(InputEventArgs input)
   at System.Windows.Input.StylusDevice.PlayBackCachedDownInputReport(Int32 timestamp)
   at System.Windows.Input.StylusLogic.PromoteStoredItemsToMouse(StylusTouchDevice touchDevice)
   at System.Windows.Input.StylusTouchDevice.OnManipulationEnded(Boolean cancel)
   at System.Windows.Input.TouchDevice.System.Windows.Input.IManipulator.ManipulationEnded(Boolean cancel)
   at System.Windows.Input.ManipulationDevice.OnManipulationCancel()
   at System.Windows.Input.ManipulationDevice.PostProcessInput(Object sender, ProcessInputEventArgs e)
   at System.Windows.Input.InputManager.RaiseProcessInputEventHandlers(ProcessInputEventHandler postProcessInput, ProcessInputEventArgs processInputEventArgs)
   at System.Windows.Input.InputManager.ProcessStagingArea()
   at System.Windows.Input.InputManager.ProcessInput(InputEventArgs input)
   at System.Windows.Input.ManipulationDevice.ProcessManipulationInput(InputEventArgs e)
   at System.Windows.Input.ManipulationLogic.ReportFrame(ICollection`1 manipulators)
   at System.Windows.Input.ManipulationDevice.ReportFrame()
   at System.Windows.Input.ManipulationDevice.RemoveManipulator(IManipulator manipulator)
   at System.Windows.Input.Manipulation.TryRemoveManipulator(UIElement element, IManipulator manipulator)
   at System.Windows.Input.TouchDevice.PromoteMainToManipulation(UIElement manipulatableElement, TouchEventArgs touchEventArgs)
   at System.Windows.Input.TouchDevice.PostProcessInput(Object sender, ProcessInputEventArgs e)
   at System.Windows.Input.InputManager.RaiseProcessInputEventHandlers(ProcessInputEventHandler postProcessInput, ProcessInputEventArgs processInputEventArgs)
   at System.Windows.Input.InputManager.ProcessStagingArea()
   at System.Windows.Input.InputManager.ProcessInput(InputEventArgs input)
   at System.Windows.Input.TouchDevice.RaiseLostCapture(IInputElement oldCapture)
   at System.Windows.Input.TouchDevice.Capture(IInputElement element, CaptureMode captureMode)
   at System.Windows.Input.TouchDevice.PromoteMainToManipulation(UIElement manipulatableElement, TouchEventArgs touchEventArgs)
   at System.Windows.Input.TouchDevice.PostProcessInput(Object sender, ProcessInputEventArgs e)
   at System.Windows.Input.InputManager.RaiseProcessInputEventHandlers(ProcessInputEventHandler postProcessInput, ProcessInputEventArgs processInputEventArgs)
   at System.Windows.Input.InputManager.ProcessStagingArea()
   at System.Windows.Input.InputManager.ProcessInput(InputEventArgs input)
   at System.Windows.Input.TouchDevice.RaiseTouchUp()
   at System.Windows.Input.TouchDevice.ReportUp()
   at System.Windows.Input.StylusLogic.PromoteMainUpToTouch(StylusDevice stylusDevice, StagingAreaInputItem stagingItem)
   at System.Windows.Input.StylusLogic.PromoteMainToTouch(ProcessInputEventArgs e, StylusEventArgs stylusEventArgs)
   at System.Windows.Input.StylusLogic.PromoteMainToOther(ProcessInputEventArgs e)
   at System.Windows.Input.StylusLogic.PostProcessInput(Object sender, ProcessInputEventArgs e)
   at System.Windows.Input.InputManager.RaiseProcessInputEventHandlers(ProcessInputEventHandler postProcessInput, ProcessInputEventArgs processInputEventArgs)
   at System.Windows.Input.InputManager.ProcessStagingArea()
   at System.Windows.Input.InputManager.ProcessInput(InputEventArgs input)
   at System.Windows.Input.StylusLogic.InputManagerProcessInput(Object oInput)
   at System.Windows.Input.StylusLogic.PreProcessInput(Object sender, PreProcessInputEventArgs e)
   at System.Windows.Input.InputManager.ProcessStagingArea()
   at System.Windows.Input.InputManager.ProcessInput(InputEventArgs input)
   at System.Windows.Input.InputProviderSite.ReportInput(InputReport inputReport)
   at System.Windows.Interop.HwndMouseInputProvider.ReportInput(IntPtr hwnd, InputMode mode, Int32 timestamp, RawMouseActions actions, Int32 x, Int32 y, Int32 wheel)
   at System.Windows.Interop.HwndMouseInputProvider.FilterMessage(IntPtr hwnd, WindowMessage msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   at System.Windows.Interop.HwndSource.InputFilterMessage(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, Int32 numArgs)
   at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 
numArgs, Delegate catchHandler)

All I have to do in order to get the exception is navigate to page in my app with a grid view on it. 

The only thing I've found that works as a work-around is to manually kill the TabTip.exe. This is obviously not an ideal solution.

Here's further information about the machine:
Operating System: Windows 8
Processor: Intel Atom CPU Z2760 @ 1.80 GHz
Installed Memory: 2.00 GB
System Type: 32-bit Operation System, x86-based processor
Pen and Touch: Pen and Full Windows Touch Support with 5 Touch Points

Whats wrong with timespan properties? It is not editable in PropertyGrid, only one-way binding works.

I created sample project to demonstrate the bug:
https://skydrive.live.com/redir?resid=51A46BBA4E9EF07E!1225

<telerik:RadPropertyGrid Item="{Binding SelectedItem, ElementName=lbxItems}">

</telerik:RadPropertyGrid>

Hi all,
I Downloaded an example of Teleik number 192546 , I changed it a bit to support drag & drop option.
and it works great,
but then I changed the Telerik.Windows.Controls.Navigation.dll  from version 2008.3.1217.35
to version 2009.3.1314.35  and suddenly  I have a problem.
the target Node Item is not expanding when I drag the source node to the target node and stand on it for a second.

could you help me?
thanks.

I am trying to embed a data trigger within a datatemplate attached to the CellTemplate property. The DataTemplate is being applied but the trigger isn't firing (I have a breakpoint set in the isLessThanZero converter and its not being called). I have seen the example of using triggers within a style but I want to have greater control around the items within my data template.

Here's the XAML I am using


Any suggestions

Ian

Hi
How to Use ColorAnimation to change the background of RadButton when IsMouseOver is True
, this is my code

<Style TargetType="telerik:RadButton">
            <Style.Triggers>
                <Trigger Property="IsMouseOver" Value="True">
                    <Trigger.EnterActions>
                        <BeginStoryboard>
                            <Storyboard >
                                <ColorAnimation From="Green" To="Yellow" Storyboard.TargetProperty="(Button.Background).(SolidColorBrush.Color)"  Duration="00:00:03" RepeatBehavior="Forever"/>
                            </Storyboard>
                        </BeginStoryboard>
                    </Trigger.EnterActions>
                </Trigger>
            </Style.Triggers>
        </Style>


But is not working.

Thanks,
Akram

Hello,

I have a problem with the TimelineViewDefinition. I have my ScheduleView with a timeline view defined. In this view I need to show only one day, and to achieve this goal, I define the attribute VisibleDays and I set it to 1. This shows perfectly fine as expected, I get one day in the timeline view. But when in a button I call the RadScheduleViewCommands.DecreaseVisibleDateLarge or RadScheduleViewCommands.IncreaseVisibleDateLarge, the Schedule advances one week instead of one day as it should. How can I solve this?

Thank you!

Hi,

<RadDiagram ...>
<primitives:GraphPaper />
</RadDiagram ...>

That tag causes an exception to be thrown:

A first chance exception of type 'System.InvalidOperationException' occurred in Telerik.Windows.Controls.Diagrams.dll

Additional information: Cannot modify the Items collection when the GraphSource is set.

What's up?

I know that since Q2 RadPdfViewer has a new property called Mode for choosing between pan and text selection. However the example in http://www.telerik.com/help/wpf/radpdfviewer-wiring-ui.html seems to use an old way. (It also doesn't have the example for text selection or find in the xaml even though the find is in the provided code behind).

It is probably just because I am new to WPF but I can't figure out what to do in the xaml. Could someone give me an updated example? Thanks.

Regardless of how I attempt to set the visibility for it, I cannot get the FilteringDropDown control within the GridViewHeaderCell for a column bound to a custom type to appear in my RadGridView. Sample code below:

 

Both with and without the HeaderCellStyle I do not get the FilteringDropDown. If I run the application with WPF Inspector or Snoop and change the FilteringUIVisibility from collapsed (which it always is) to visible (which the default is and what I set it to manually) then the FilteringDropDown appears and I can use my custom filter. I am assuming some code in the control is overriding my styling based on the non-standard object type (which is why I have custom sorting on the column as well) but I cannot figure out how to avoid it or restore the FilteringDropDown.

Hello,

Recently we updated the Telerik assemblies in our product to 2012.3.1017.40 and we've encountered an issue. When the user drags a column header to the group panel they encounter a NullReferenceException. We're hosting the control in a Windows Forms ElementHost control.

Any ideas on a workaround would be very helpful.

Stack Trace:
   at Telerik.Windows.Controls.DraggedElement.HideNoCursor()
   at Telerik.Windows.Controls.GridView.DragDropController.OnGroupPanelDragOver(Object sender, DragEventArgs e)
   at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
   at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
   at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
   at Telerik.Windows.DragDrop.DragDropManager.DelegateHelper.OnDragEventHandler(Object sender, DragEventArgs e)
   at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
   at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
   at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
   at System.Windows.OleDropTarget.RaiseDragEvent(RoutedEvent dragEvent, Int32 dragDropKeyStates, Int32& effects, DependencyObject target, Point targetPoint)
   at System.Windows.OleDropTarget.MS.Win32.UnsafeNativeMethods.IOleDropTarget.OleDragOver(Int32 dragDropKeyStates, Int64 point, Int32& effects)

Let me know if you need any more information. 

Thanks Much,
~Boots