Sets
            the mode of a dialog box tile
         
         
         Arguments
         
- key
 
            - 
               
                  A string that specifies
                     the tile. The key argument is case-sensitive.
                  
                
             - mode
 
            - 
               
                  An integer that can be
                     one of the following:
                  
                  0   Enable tile
                  
                  1   Disable
                     tile
                  
                  2   Set focus
                     to tile
                  
                  3   Select edit
                     box contents
                  
                  4   Flip image
                     highlighting on or off
                  
                
             
         
         Return Values
         
         nil