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 LButtonDown     Action to be performed when clicking the mouse
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Parameters:

   Syntax: LButtonDown( nRow, nCol, nKeyFlags ) --> Nil 

   Parameters:

   <nRow>      The pixel row where the mouse cursor was
               positioned when the mouse click occurred.

   <nCol>      The pixel column where the mouse cursor
               was positioned when the mouse click
               occurred.

   <nKeyFlags> Indicates which virtual keys are down and
               if the right or the middle mouse button was
               pressed also.

               It can be a combination of the following
               values which have the following constant
               names in the MS-Windows API description::

               MK_RBUTTON  2   The right mouse button was
                              pressed also.

               MK_SHIFT    4   The <Shift> key was
                              pressed.

               MK_CONTROL  8   The <ctrl> key was pressed.

               MK_MBUTTON  16  The middle mouse button was
                              pressed.


   Comments:
   This method is called whenever the left mouse button is pushed down.
   lButtonDown() will check to see if the bLClicked instance variable
   contains a code block. If that is the case the codeblock will be
   called with the parameters LButtonDown() has received.