Exception on shutdown in mdi app

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   I'm using the dockingpane ActiveX control in a C# .NET app. My main form is an MDIContainer so in order to create panes I have to include the following code:

foreach (Control ctrl in this.Controls)
{
if (ctrl is MdiClient)
{ 
DockingPaneManager.SetMDIClient(ctrl.Handle.ToInt32());
}
}
Does anyone know what this code does? And why I receive "NullReferenceException: Object reference not set to an instance of an object" at shutdown when I include it? 
I'm using the new dockingpane activeX control version 9.7. Any help/ideas is appreciated! 

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rkosbab Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 17 May 2005 Location: United States Status: Offline Points: 4	Post Options Post Reply Quote rkosbab Report Post Thanks(0) Quote Reply Topic: Exception on shutdown in mdi app Posted: 17 May 2005 at 9:52am
	I'm using the dockingpane ActiveX control in a C# .NET app. My main form is an MDIContainer so in order to create panes I have to include the following code: foreach (Control ctrl in this.Controls) { if (ctrl is MdiClient) { DockingPaneManager.SetMDIClient(ctrl.Handle.ToInt32()); } } Does anyone know what this code does? And why I receive "NullReferenceException: Object reference not set to an instance of an object" at shutdown when I include it? I'm using the new dockingpane activeX control version 9.7. Any help/ideas is appreciated!
	Ross Kosbab C# calling ActiveX

rkosbab Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 17 May 2005 Location: United States Status: Offline Points: 4	Post Options Post Reply Quote rkosbab Report Post Thanks(0) Quote Reply Posted: 24 May 2005 at 8:30am
	I've narrowed the issue down: My app contains Syncfusion Menu bars, if I exit the app via the Syncfusion menu-bar File->exit the app shut's down correctly. If I close the app via the 'X' button in the top-right frame I recieve the exception. However I don't know of any workarounds or fixes(aside from buying CodeJock's commandbars and redesigning all my existing Syncfusion menus).
	Ross Kosbab C# calling ActiveX

Flex Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 20 May 2005 Location: United Kingdom Status: Offline Points: 8	Post Options Post Reply Quote Flex Report Post Thanks(0) Quote Reply Posted: 25 May 2005 at 7:27am
	Are you enabling visualstyles in the application? Try commenting out the line where you do if you are...

rkosbab Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 17 May 2005 Location: United States Status: Offline Points: 4	Post Options Post Reply Quote rkosbab Report Post Thanks(0) Quote Reply Posted: 26 May 2005 at 11:21am
	I commented out the 2003 visualstyle I had but no luck.
	Ross Kosbab C# calling ActiveX