UniTreeMenu只展开一个Item，点击主菜单时，不打开最后一个item

设置：

procedure TMainForm.UniTreeMenu1Click(Sender: TObject);
var
Node:TUniTreeNode;
Ts: TUniTabSheet;
FrC: TUniFrameClass;
Fr: TUniFrame;
FClassName,ShowInfo:string;
begin
Node:= UniTreeMenu1.Selected;

if Node.Tag>1000 then
beginTs:=Node.Data;if not Assigned(Ts) thenbegintryFClassName:='TSub'+copy(IntToStr(Node.Tag),2,3);Frc:=TUniFrameClass(FindClass(FClassName));Ts:=TUniTabSheet.Create(Self);Ts.PageControl:=UniPageControl1;Ts.Closable:=True;Ts.OnClose:=UniTabSheetClose;Ts.Caption:=Node.Text;Fr:=Frc.Create(Self);dm.Auser.Fcode:=copy(Node.Text,1,3);Fr.Align:=alClient;Fr.Parent:=Ts;Node.Data:=Ts;Ts.Data:=Node;exceptShowInfo:='无指定的模块：'+FClassName;MessageDlg(ShowInfo, mtError, [mbOK],nil);
//             UniSession.AddJS('Ext.get("messagebox-1001_header-title-textEl").setText("")');Exit;end;end;UniPageControl1.ActivePage := Ts;
end;

// end else begin
// if Node.Expanded = False then
// Node.Expanded := True
// else Node.Expanded := False;
// end;

end;