By default, the ShowIdem property is " " (single space). The ShowIdem property has effect only if the PivotRows property includes multiple-columns and the ShowBranchTree property is exBranchColumns. The ShowIdem property defines the symbol used to indicate repeated captions, providing a clear visual cue for identical entries. The ShowIdem property defines the symbol only for pivot-row columns (columns that were generated by the PivotRows property).

For instance, 

• "", no effect (empty string) (the original caption is show as it is)
• " ", indicates that a blank space is shown for identical captions
• "<fgcolor gray>&#12291;", displays the 〃 symbol (ditto mark or quote character) for repeated captions in gray (idem).

The following screen shot shows the control while ShowIdem property is " " (default, single space):

The following screen shot shows the control while ShowIdem property is "<fgcolor light gray>&#12291;":

The following screen shot shows the control while ShowIdem property is "" (empty string):