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dfPro()
Displays a scroll bar
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Syntax:

     dfPro( <nTop>, <nLeft>, <nRight>,    ;
            <nCurrent>, <nTotal>, <cColor> ) --> NIL

Parameters:

     <nTop>, <nLeft> Starting coordinates
     <nRight>   Scroll bar lenght
     <nCurrent> Current number of items
     <nTotal>   Total number of items. The percentage is calculated as
     100:nTotal=X:nCurrent
     <cColor>   Scroll bar color

Returns:

     NIL

Description:

     Draws a scroll bar on the screen, which puts in evidence a percentage.

Example:

     //Draws a scrollbar to display a 10% percentage
     dfPro( 1, 10, 24, 20, 200, "W+/B" )

See also:

     dfWaitOn()