perl Tkx - DynamicHelp

Perl/Tcl/Tk/Tkx Users,

I'm using Perl Tkx, so this is sort of a Tcl/Tk question, also.

I'm trying to delete some balloon help text from a Tk Canvas item using 
the BWidget widget, DynamicHelp.

This code adds the help (works fine)

              Tkx::DynamicHelp__add ( $canvasTop, -item=> 'ab_atk', 
-text => 'My tooltip help text' );


This code does NOT work, results in run-time error.

             Tkx::DynamicHelp__delete ( $canvasTop, -item=> 'ab_atk' );


This code seems to act as a good workaround
              Tkx::DynamicHelp__add ( $canvasTop, -item=> 'ab_atk', 
-text => '' );

Although the work around seems to work fine, I was wondering if there 
was a way to use the "delete" method.


Thanks,
Mike