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 Events management xBase commands
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   Defining a 'call-back' action           ON <EventName> <uAction>
   for an event.

   <EventName>      This clause depends on the event we want to control.
                    It may be: PAINT, CLICK, RESIZE, ... (many different
                    ones).

   <uAction>        The 'call-back' action to be evaluated when that
                    event occurs.

                    FiveWin generates a codeblock from the <uAction> you
                    specify:

                    ACTIVATE WINDOW oWnd ;
                    ...
                    ON CLICK MsgInfo( "Hello" )  -->
                         oWnd:bLClicked = { || MsgInfo( "Hello" ) }