Hello,

the best way to avoid fleeking is to inherit from CXTPTabClientWnd and to catch the WM_MDIACTIVATE message. You should then lock the redraw before calling the base class and unlock it after execution.  See code below.

best regards from Göttingen, germany

void CMainTabClientWnd::OnMDIActivate(BOOL bActivate,CWnd* pActivateWnd, CWnd* pDeactivateWnd)
{
SetRedraw(FALSE);
CWnd::OnMDIActivate(bActivate, pActivateWnd, pDeactivateWnd);
SetRedraw(TRUE);

RedrawWindow( NULL, NULL, RDW_INVALIDATE | RDW_UPDATENOW | RDW_ERASE | RDW_ALLCHILDREN);
}

BOOL CChildFrame::PreCreateWindow(CREATESTRUCT& cs)
{
 // Make sure view is maximum size to eliminate
 // flicker when switching tabs.
 cs.x = cs.y = 0; 
 cs.cx = cs.cy = 32767;

 if( !CMDIChildWnd::PreCreateWindow(cs) )
  return FALSE;

 return TRUE;
}

When using CXTTabClientWnd for tabbed windows the redraw is messy when switching between windows when they are maximised. It looks as though when you press the tab to change active window, the window is first drawn restored, then drawn maximised which makes it look messy. It is easily reproducable using the toolkit example program MDIPanes.

In MDIPanes ManFrm.h add the following member variable to add tabbed windows

CXTPTabClientWnd m_MTIClientWnd

Then in CMainFrame::OnCreate, add the following line before LoadCommandBars

m_MTIClientWnd.Attach (this, FALSE);

Then when you run the application, add a couple of new documents, maximize the documents, and then switch between them using the tabs.

Thanks,

Graham