Pane paint problem during expand/collapse

I am having problems with windows behind my application being allowed to write over my MDI app mainframe and panes during the expansion and collapse of panes.

I can see a similiar, but not identical, result by openning the GUI_VisualStudio7_vc71 sample application and execute it (debug) in front of VS with the VS Output window behind the same corner of the frame (lower right).  In this case, each time I open the side tab window on the left, it causes the painting of a miss aligned segment of the bottom pane border and then leaves it that way until the bottom pane is selected.  Each time the tab window on the left is openned, another miss aligned segment of the lower pane border is written above the last in the area over the VS Output window.

20071105_133824_TestDock.zip
It's the sample. Hide all panes to the left side. Then click on Properties and Options quickly.

My sample don't work properly on v11.2.0.

I have no splitter and view has WS_CLIPCHILDREN|WS_CLIPSIBLINGS styles.

In attached sample replace

BOOL CMainFrame::OnCreateClient(LPCREATESTRUCT /*lpcs*/,

CCreateContext* pContext)

{

m_wndSplitter.Create(this,

2, 2, // TODO: adjust the number of rows, columns

CSize(10, 10), // TODO: adjust the minimum pane size

pContext);

m_wndSplitter.ModifyStyle(0, WS_CLIPSIBLINGS | WS_CLIPCHILDREN);

return TRUE;

}

 

and it will work.