if i declare a listbox as below: $lstbox = $frmmain->AddListbox ( -name => "lstbox", -top => 5, -height => 50, -width => 100, -multisel => 1, -style => WS_VSCROLL ) the multiselect does not work, and neither does any function related to the listbox (SelectedItems(), Count(), etc). if i switch the last two options (-multisel and -style), things work fine! is this a bug?