procedure THIMST_SelectRow._work_doSelectInvert;
var
  sControl: PControl;
  i: integer;
begin
  if not Assigned(_prop_MSTControl) then exit;
  sControl := _prop_MSTControl.ctrlpoint;
  if (sControl.Count = 0) or not(lvoMultiSelect in sControl.LVOptions) then exit;
  for i := 0 to sControl.Count - 1 do
    if (lvisSelect in sControl.LVItemState[i]) then
      sControl.LVItemState[i] := []
    else
      sControl.LVItemState[i] := [lvisSelect, lvisFocus];
  _hi_onEvent(_event_onSelectRow); 
end;