Forum

      I have added a CExtResizableDialog into CExtToolControlBar, But I find it can not trigger OnPaint event when I want to repaint the content of CExtResizableDialog;

You cannot handle the WM_PAINT windows message in the OnPaint() method because it’s intercepted in the WindowProc() virtual method of the resizable dialog’s base type. Please override the WindowProc() virtual method like as follows:

LRESULT CYourDialog:WindowProc(
    UINT message, WPARAM wParam, LPARAM lParam )
{
    switch( message )
    {
    case WM_PAINT:
        {
            CPaintDC dc( this );
            . . .
        }
        return 0;
    } // switch( message )
    return
        CExtResizableDialog::WindowProc(
            message, wParam, lParam );
}

The background of the resizable dialog is painted in the CExtWS::WindowProc() method. You might need to copy some parts of this method into your WM_PAINT handler code.