Available for window objects (Window, MDIWindow and DialogBox).
Read/Write only at design time
Specifies whether a window object displays a button with a question mark in its caption (title bar). It can be one of the following values:
TRUE Window displays a button with a question mark.
FALSE Window does not display a button with a question mark (default).
REMARKS: When clicking the button with a question mark, the cursor changes to a
question mark with a pointer. If a child control is clicked then, it receives a WM_HELP message. For the question mark button to be able to appear,
at least one of the other three buttons in the upper-right part of the caption must not be
visible.