CXTPTabClientWnd - EnableTearOff issues

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   If you enable tear off in CXTPTabClientWnd object, you can take off tabs from the window and it works, it will spawn a new window once taken outside the window. Then that new window can be placed back onto it's original window, bringing back the taken off tabs. However, if you take off a tab from that new window, if the tab is the only tab appearing on that window, it will initially once again create a new window - but otherwise program will completely break during processing input messages, with assertions implying that the program is still trying to access a window that doesn't exist.
The issue can be easily reproduced by simply adding a m_wndClient.EnableTearOff(); line in RibbonMDISample.

We have created a video that more clearly shows the issue: https://statica.pl/pliki/n5/RibbonMDI_Tearoff.mp4

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jw_statica Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 23 May 2018 Status: Online Points: 29	Post Options Post Reply Quote jw_statica Report Post Thanks(0) Quote Reply Topic: CXTPTabClientWnd - EnableTearOff issues Posted: 10 February 2025 at 5:24am
	If you enable tear off in CXTPTabClientWnd object, you can take off tabs from the window and it works, it will spawn a new window once taken outside the window. Then that new window can be placed back onto it's original window, bringing back the taken off tabs. However, if you take off a tab from that new window, if the tab is the only tab appearing on that window, it will initially once again create a new window - but otherwise program will completely break during processing input messages, with assertions implying that the program is still trying to access a window that doesn't exist. The issue can be easily reproduced by simply adding a m_wndClient.EnableTearOff(); line in RibbonMDISample. We have created a video that more clearly shows the issue: https://statica.pl/pliki/n5/RibbonMDI_Tearoff.mp4

agontarenko Members Profile Send Private Message Find Members Posts Add to Buddy List Admin Group Joined: 25 March 2016 Status: Offline Points: 303	Post Options Post Reply Quote agontarenko Report Post Thanks(0) Quote Reply Posted: 19 February 2025 at 10:27am
	Hello, To resolve your provblem you need to change 1. Base class to CXTPMDIFrameWndEx. class CMainFrame : public CXTPMDIFrameWndEx 2. Add virtual functions as below virtual CXTPDockingPaneManager* GetDockingPaneManager(); virtual CXTPTabClientWnd* GetTabClientWnd(); CXTPDockingPaneManager* CMainFrame::GetDockingPaneManager() { return NULL; } CXTPTabClientWnd* CMainFrame::GetTabClientWnd() { return &m_wndClient; } 3. See please MDITabWindow and GUI_VisualStudio samples Regards, Artem Gontarenko

jw_statica Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 23 May 2018 Status: Online Points: 29	Post Options Post Reply Quote jw_statica Report Post Thanks(0) Quote Reply Posted: Yesterday at 6:17am
	Unfortunately the same crash happens in unmodified MDITabWindow and GUI_VisualStudio. They seem to have both of these overrides implemented. The crash can be easily reproduced in those examples the same way as shown in the RibbonMDI video.

agontarenko Members Profile Send Private Message Find Members Posts Add to Buddy List Admin Group Joined: 25 March 2016 Status: Offline Points: 303	Post Options Post Reply Quote agontarenko Report Post Thanks(0) Quote Reply Posted: 1 hour 19 minutes ago at 5:48am
	Hello, What version of CJ you use? What version of Windows and Vistual Studio you use? Regards, Artem Gontarenko

jw_statica Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 23 May 2018 Status: Online Points: 29	Post Options Post Reply Quote jw_statica Report Post Thanks(0) Quote Reply Posted: 44 minutes ago at 6:23am
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