delphi - TListViewItem Checked property isn't visually synced -

delphi - TListViewItem Checked property isn't visually synced -

i have tlistview, add together new item when user drops file onto it. when clicks on item toggles between checked , unchecked states.

procedure tmainform.ui_worklistitemclickex(const sender: tobject; itemindex: integer; const localclickpos: tpointf; const itemobject: tlistitemobject); begin tlistview(sender).items[itemindex].checked:=not tlistview(sender).items[itemindex].checked; end;

the problem is, visually nil happens.

delphi firemonkey delphi-xe7