Hiding bookmark selection

+m+

Goodmorning, is it possible to hide (or show) the text into a bookmark?

This works

Code

if WP.BookmarkSelect('pippo',false) then wp.TextCursor.CurrAttribute.ToggleCharstyle(WPSTY_HIDDEN);

...
but this don't

Code

if WP.BookmarkSelect('pippo',false) then
   begin
       if SHOW then
           wp.TextCursor.CurrAttribute.SetCharstyles(WPSTY_HIDDEN,0)
       else
           wp.TextCursor.CurrAttribute.SetCharstyles(WPSTY_HIDDEN,1);
   end;

I don't want to toggle the hidden attribute of selected text (bookmark), I want to set.
Best regards, Mario