Specifies which icons appear on the title bar of the form.
May contain the following values:
||The form has a Control menu (also known as a System menu).
||The form has a Minimize button
||The form has a Maximize button
||If BorderStyle is bsDialog or biMinimize and biMaximize are excluded, a question mark appears in the form's title bar and when clicked, the cursor changes to crHelp; otherwise, no question mark appears.