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As a simple example of this, I have an SDI application with two toolbars.  In MainFrm.f I add the following member to CMainFrame:

 CExtNCSB<CTreeCtrl>  m_treeTest;

At the end of CMainFrame::OnCreate(), I have the following:

 ::SetRect(&rectWork, 0, 0, 100,100);

 VERIFY(m_treeTest.Create(WS_CHILD, rectWork, this, 3000));

It crashes so badly the stack is lost.

I tried constructing it with:

   bool bNcsbDelayedInitialization = true



   bool bNcsbForceMiddleContainerMode = false

That worked.  Can you explain these two arguments?

I tried adding contructor arguments:

   bool bNcsbDelayedInitialization = true

   bool bNcsbForceMiddleContainerMode = true

Then it doesn’t crash during construction but it crashes as soon as I set the focus to it.

(This is in my actual application, not in the example sited above).

We explained you details about the CExtNCSB template class in other thread. Please check how and where you are using the tree control.

BTW,

It works fine with CTreeCtrl instead of CExtNCSB<TreeCtrl>.

It still crashes without the VERIFY() wrapper.