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  Argument
 
    TextString    String to be displayed
 
  Returns
 
    Integer       Width in pixels
 
  Description
 
    The _GetGTextExtent function returns the width required to print
    the text string with the current font using the _OutGText procedure.
 
    This function is particularly helpful in determining the size for
    text that uses proportional-spaced fonts.
 
  _GrStatus Returns
 
    _GrError