PRB: Child CPropertySheet Hangs If Focus Is Switched (149501)

CAUSE

By default, CPropertyPages have a WS_EX_CONTROLPARENT style. However, CPropertySheets do not have this style. This style allows a user to press the TAB key to move from a control inside the page to one in the sheet.

When the focus is switched from the CPropertyPage, code that handles default command buttons loops through all the controls in the pages and the sheet. Cycling through controls is done using GetNextDlgTabItem(). The loop cycles through controls in the page in the child CPropertySheet and finds its way to controls in the parent page or parent dialog. At this point, GetNextDlgTabItem() is not able to find controls inside the child CPropertySheet because it doesn't have a WS_EX_CONTROLPARENT style. The loop never ends because it never finds the original control that had the focus.

   // CMySheet is derived from CPropertySheet
   BOOL CMySheet::OnInitDialog()
   {
             ModifyStyleEx (0, WS_EX_CONTROLPARENT);
             return CPropertySheet::OnInitDialog();
   }

   /* Compile options needed: default
   */