My app will crash when pin pane after restart.

I am using tookit pro 10.4.2.

 

My app is a MFC MDI app. And it has two panes on the left.  First hide both of them by clicking auto hide pin button.  Then close my app and restart it. Then hover mouse over the pane tab so that the pane is displayed and then try to pin the pane. As soon as the pin is clicked, it will shows as below picture, and often my app will crash after this.  I have tried to search some help on our forum. I also tried  add  "cs.style |= WS_CLIPCHILDREN|WS_CLIPSIBLINGS; " in all of my frames and views. But it didn't work.  

 PS: It works OK if I don't restart my app.

 

Debut informations:

Call Static:

  ToolkitPro1042vc90UD.dll!012078c8()  
  [Frames below may be incorrect and/or missing, no symbols loaded for ToolkitPro1042vc90UD.dll] 
  ToolkitPro1042vc90UD.dll!0120795b()  
  ToolkitPro1042vc90UD.dll!01201299()  
> mfc90ud.dll!CWnd::OnWndMsg(unsigned int message=15, unsigned int wParam=0, long lParam=0, long * pResult=0x0012fc08)  Line 2042 C++
  mfc90ud.dll!CWnd::WindowProc(unsigned int message=15, unsigned int wParam=0, long lParam=0)  Line 1755 + 0x20 bytes C++
  mfc90ud.dll!AfxCallWndProc(CWnd * pWnd=0x0745e1b8, HWND__ * hWnd=0x00500ec2, unsigned int nMsg=15, unsigned int wParam=0, long lParam=0)  Line 240 + 0x1c bytes C++
  mfc90ud.dll!AfxWndProc(HWND__ * hWnd=0x00500ec2, unsigned int nMsg=15, unsigned int wParam=0, long lParam=0)  Line 403 C++
  mfc90ud.dll!AfxWndProcBase(HWND__ * hWnd=0x00500ec2, unsigned int nMsg=15, unsigned int wParam=0, long lParam=0)  Line 441 + 0x15 bytes C++
  user32.dll!_InternalCallWinProc@20()  + 0x28 bytes 
  user32.dll!_UserCallWinProcCheckWow@32()  + 0xb7 bytes 
  user32.dll!_DispatchClientMessage@20()  + 0x4d bytes 
  user32.dll!___fnDWORD@4()  + 0x24 bytes 
  ntdll.dll!7c90e473()  
  user32.dll!_NtUserDispatchMessage@4()  + 0xc bytes 
  e87e428e() 

 

It maybe results from handling WM_PAINT message. 

 

Very hard to suggest something without reproduce sample.

 

Sent.