How to get column description from row no in select list of hwtk

Refer to hwtk examples

@tinh i have created a hwtk select list. whenever i click one row from description and curse over other rows, they are getting autoselected. How to avoid this.

    set ::OPTT_ASSIGN_GUI::sl [hwtk::selectlist $::OPTT_ASSIGN_GUI::f_main.visulization_frame.compvisulization_frame -stripes 1 -selectmode multiple -selectcommand '::OPTT_ASSIGN_GUI::OnSelect %W %S %c']

Try changing -selectmode to single