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 METHOD AEvalWhen CLASS TWindow
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Syntax:
   TWindow:AEvalWhen()  -->

Purpose:
The AEValWhen() method evaluates the ::bWhen instance variable (only if ::bWhen
contains a code block ) from each control that is associated with this window. When
the evaluation of the ::bWhen codeblock (of a particular control) results in .F. that
particular control is disabled (ie it will not receive focus when clicked on, and can
not be reached by using the keyboard).