RadWindow Exception on closing

[Christian]

Hi there,

I did add the RadWindow class to my project and I found an exception occuring somehow in a random fashion.

There are serveral RadWindows in my application and they do work fine. But when I do add the ShowDialog of one of the RadWindows to the SelectionChanged event of a RadTreeView on my form, I do receive the exception shown below when closing the window again. This exception does not always show up, it only occures in a somehow random way. As you can see, there seems to be a problem in the OnThumbDragStarted event handler or one of the methods it is using.

I'm using the Q1 2011 version of the telerik libraries as I did update the version when I was working on this issue, but the update did not solve the problem.

Do you guys have an idea why I do receive this exception?

<P>Parameter name: otherVisual</P>
<P>at System.Windows.Media.Visual.FindCommonVisualAncestor(DependencyObject
otherVisual)</P>
<P>at System.Windows.Media.Visual.TransformToVisual(Visual visual)</P>
<P>at Telerik.Windows.Controls.RadWindow.OnThumbDragStarted(Object sender,
DragStartedEventArgs e) in
c:\Builds\WPF_Scrum\Release_WPF\Sources\Development\Controls\Navigation\Window\RadWindow.cs:line
2125</P>
<P>at
System.Windows.Controls.Primitives.DragStartedEventArgs.InvokeEventHandler(Delegate
genericHandler, Object genericTarget)</P>
<P>at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object
target)</P>
<P>at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target,
RoutedEventArgs routedEventArgs)</P>
<P>at System.Windows.EventRoute.InvokeHandlersImpl(Object source,
RoutedEventArgs args, Boolean reRaised)</P>
<P>at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender,
RoutedEventArgs args)</P>
<P>at System.Windows.UIElement.RaiseEvent(RoutedEventArgs e)</P>
<P>at
System.Windows.Controls.Primitives.Thumb.OnMouseLeftButtonDown(MouseButtonEventArgs
e)</P>
<P>at System.Windows.UIElement.OnMouseLeftButtonDownThunk(Object sender,
MouseButtonEventArgs e)</P>
<P>at System.Windows.Input.MouseButtonEventArgs.InvokeEventHandler(Delegate
genericHandler, Object genericTarget)</P>
<P>at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object
target)</P>
<P>at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target,
RoutedEventArgs routedEventArgs)</P>
<P>at System.Windows.EventRoute.InvokeHandlersImpl(Object source,
RoutedEventArgs args, Boolean reRaised)</P>
<P>at System.Windows.UIElement.ReRaiseEventAs(DependencyObject sender,
RoutedEventArgs args, RoutedEvent newEvent)</P>
<P>at System.Windows.UIElement.OnMouseDownThunk(Object sender,
MouseButtonEventArgs e)</P>
<P>at System.Windows.Input.MouseButtonEventArgs.InvokeEventHandler(Delegate
genericHandler, Object genericTarget)</P>
<P>at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object
target)</P>
<P>at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target,
RoutedEventArgs routedEventArgs)</P>
<P>at System.Windows.EventRoute.InvokeHandlersImpl(Object source,
RoutedEventArgs args, Boolean reRaised)</P>
<P>at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender,
RoutedEventArgs args)</P>
<P>at System.Windows.UIElement.RaiseTrustedEvent(RoutedEventArgs args)</P>
<P>at System.Windows.UIElement.RaiseEvent(RoutedEventArgs args, Boolean
trusted)</P>
<P>at System.Windows.Input.InputManager.ProcessStagingArea()</P>
<P>at System.Windows.Input.InputManager.ProcessInput(InputEventArgs input)</P>
<P>at System.Windows.Input.InputProviderSite.ReportInput(InputReport
inputReport)</P>
<P>at System.Windows.Interop.HwndMouseInputProvider.ReportInput(IntPtr hwnd,
InputMode mode, Int32 timestamp, RawMouseActions actions, Int32 x, Int32 y,
Int32 wheel)</P>
<P>at System.Windows.Interop.HwndMouseInputProvider.FilterMessage(IntPtr hwnd,
WindowMessage msg, IntPtr wParam, IntPtr lParam, Boolean& handled)</P>
<P>at System.Windows.Interop.HwndSource.InputFilterMessage(IntPtr hwnd, Int32
msg, IntPtr wParam, IntPtr lParam, Boolean& handled)</P>
<P>at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr
lParam, Boolean& handled)</P>
<P>at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)</P>
<P>at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate
callback, Object args, Int32 numArgs)</P>
<P>at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source,
Delegate method, Object args, Int32 numArgs, Delegate catchHandler)</P>
<P>at System.Windows.Threading.Dispatcher.InvokeImpl(DispatcherPriority
priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)</P>
<P>at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr
wParam, IntPtr lParam)</P>
<P>at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)</P>
<P>at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame
frame)</P>
<P>at System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame)</P>
<P>at System.Windows.Threading.Dispatcher.Run()</P>

at

[George]

Hello Christian,

Thank you for contacting us.

Could you please call the RadWindow.ShowDialog method within a Dispatcher? This could resolve the problem. Please, let me know if this helps, I am glad to assist you further.

Regards,
George
the Telerik team

[Christian]

Hi George,

I'm calling the ShowDialog method now this way:

Application.Current.Dispatcher.BeginInvoke(DispatcherPriority.Background, new Action(() => dlg.ShowDialog()));

and I did not receive the exception anymore but i certainly need to investigate it further....

Why is the ShowDialog method causing these troubles?

[George]

Hello Christian,

We are not sure what causes this exception. We will greatly appreciate a sample project that reproduces the problem, so we can make some tests and pinpoint the problem locally. Can you attach the project to this thread? 

Regards,
George
the Telerik team

[Christian]

Hi George,

I can not attach the real project as it is way too big to add it here but i will create a demo project where this problem occures. I will post it here the next few days when I find time to create the project...

Regards
Chris