DocumentManager.get_ActiveDocument() Exception

[Simon Maystre]

I have a dock control with 6 minimized toolbar windows and all works as expected accept when a tabbed document it loaded into the MDI area and one of the toolbar windows is opened and a control within that toolbar window is clicked the following exception is thrown:

System.NullReferenceException was unhandled
  Message=Object reference not set to an instance of an object.
  Source=Telerik.WinControls.RadDock
  StackTrace:
       at Telerik.WinControls.UI.Docking.DocumentManager.get_ActiveDocument()
       at Telerik.WinControls.UI.Docking.DocumentManager.InsertDocument(Int32 index, DockWindow document)
       at Telerik.WinControls.UI.Docking.DocumentManager.EnsureActiveDocument()
       at Telerik.WinControls.UI.Docking.DocumentManager.get_ActiveDocument()
       at Telerik.WinControls.UI.Docking.DocumentManager.OnActiveWindowChanged(DockWindow currActive)
       at Telerik.WinControls.UI.Docking.RadDock.OnActiveWindowChanged(DockWindowEventArgs e)
       at Telerik.WinControls.UI.Docking.RadDock.UpdateActiveWindow(DockWindow window, Boolean forceNotify)
       at Telerik.WinControls.UI.Docking.RadDock.ActivateWindow(DockWindow window, Boolean forceNotify)
       at Telerik.WinControls.UI.Docking.RadDock.set_ActiveWindow(DockWindow value)
       at Telerik.WinControls.UI.Docking.DockWindow.OnEnter(EventArgs e)
       at System.Windows.Forms.Control.NotifyEnter()
       at System.Windows.Forms.ContainerControl.UpdateFocusedControl()
       at System.Windows.Forms.ContainerControl.AssignActiveControlInternal(Control value)
       at System.Windows.Forms.ContainerControl.ActivateControlInternal(Control control, Boolean originator)
       at System.Windows.Forms.ContainerControl.ActivateControlInternal(Control control, Boolean originator)
       at System.Windows.Forms.ContainerControl.ActivateControlInternal(Control control)
       at System.Windows.Forms.Control.WmSetFocus(Message& m)
       at System.Windows.Forms.Control.WndProc(Message& m)
       at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
       at Telerik.WinControls.RadControl.WndProc(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
       at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
       at System.Windows.Forms.UnsafeNativeMethods.SetFocus(HandleRef hWnd)
       at System.Windows.Forms.Control.FocusInternal()
       at System.Windows.Forms.Control.Focus()
       at Telerik.WinControls.RadControl.ProcessFocusRequested(RadElement element)
       at Telerik.WinControls.RadControl.WndProc(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
       at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
       at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
       at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData)
       at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
       at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
       at System.Windows.Forms.Application.Run(ApplicationContext context)
       at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.OnRun()
       at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.DoApplicationModel()
       at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.Run(String[] commandLine)
       at PCNManager.My.MyApplication.Main(String[] Args) in 17d14f5c-a337-4978-8281-53493378c1071.vb:line 81
       at System.AppDomain._nExecuteAssembly(Assembly assembly, String[] args)
       at System.AppDomain.nExecuteAssembly(Assembly assembly, String[] args)
       at System.Runtime.Hosting.ManifestRunner.Run(Boolean checkAptModel)
       at System.Runtime.Hosting.ManifestRunner.ExecuteAsAssembly()
       at System.Runtime.Hosting.ApplicationActivator.CreateInstance(ActivationContext activationContext, String[] activationCustomData)
       at System.Runtime.Hosting.ApplicationActivator.CreateInstance(ActivationContext activationContext)
       at System.Activator.CreateInstance(ActivationContext activationContext)
       at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssemblyDebugInZone()
       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:

Any assistance would be appreciated.

Thanks

Simon

[Julian Benkov]

Hello Simon Maystre,

We can not reproduce the reported exception. Therefore, please send us a simple application with your scenario to investigate the issue locally and find best solution for your application.

Best wishes,
Julian Benkov
the Telerik team

[Simon Maystre]

Julian,

Thanks for the reply... I have found out what was causing the problem. I was adding controls directly to the DocumentContainer object of RadDock (i.e tab controls and pictureboxes) rather than creating a form in code then adding the controls to that form to then add the form to the MDIParent. Once I did this all is OK but thanks for looking into this.

Simon