radpageview strip tab edit on doubleclick

but having this nullreferenceerror while disposing any from after editing .... on base.Dispose(disposing)

 at Telerik.WinControls.UI.ImeSupport.CreateContext()
   at Telerik.WinControls.UI.ImeSupport.OnGotKeyboardFocus(Object sender, EventArgs e)
   at System.Windows.Forms.Control.OnGotFocus(EventArgs e)
   at Telerik.WinControls.RadControl.OnGotFocus(EventArgs e)
   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 Telerik.WinControls.RadNCEnabledControl.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.ContainerControl.FocusActiveControlInternal()
   at System.Windows.Forms.Form.set_Active(Boolean value)
   at System.Windows.Forms.Form.WmActivate(Message& m)
   at System.Windows.Forms.Form.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.IntDestroyWindow(HandleRef hWnd)
   at System.Windows.Forms.UnsafeNativeMethods.DestroyWindow(HandleRef hWnd)
   at System.Windows.Forms.NativeWindow.DestroyHandle()
   at System.Windows.Forms.Control.DestroyHandle()
   at System.Windows.Forms.Control.Dispose(Boolean disposing)
   at System.Windows.Forms.Form.Dispose(Boolean disposing)
   at Telerik.WinControls.UI.RadFormControlBase.Dispose(Boolean disposing)
   at Telerik.WinControls.UI.RadForm.Dispose(Boolean disposing)
   at Enps.ChangeReportSubject.Dispose(Boolean disposing) in C:\Users\yaseen\Documents\Visual Studio 2010\Projects\Enps\Enps\Enps\ChangeReportSubject.Designer.cs:line 22