winforms - Avoid radcombobox suggest list from being collapsed -

winforms - Avoid radcombobox suggest list from being collapsed -

i have raddropdownlist in suggestappend mode , usercontrol keyboard, have buttons controlstyles.selectable = false. mouseup event fires sendkeys.send(key). thing when focus in raddropdownlist , write keyboard (usercontrol) suggest list appears milisecond , desappear. tried command popup event seems have nil suggest list. how can maintain opened showing suggestions until user leaves raddropdownlist?

here how access auto finish suggest popup , cancel closure of popup:

raddropdownlist1.dropdownlistelement.autocompletesuggest.dropdownlist.popupclosing += dropdownlist_popupclosing; . . . void dropdownlist_popupclosing(object sender, telerik.wincontrols.ui.radpopupclosingeventargs args) { args.cancel = true; }

winforms user-controls telerik