UniComboBox in frame

[danly]

hello,

I'm having its Unigui tested.

how do I achieve a combobox on a frame ?

procedure TMainForm.UniBitBtn2Click(Sender: TObject);
var
  FrC : TUniFrameClass;
  Fr : TUniFrame;  
begin  
  Frc := TUniFrameClass(FindClass('UniURLFrameSimpleWebBrowser'));
  fr.Assign(TUniFrame(frc));  //error 

  fr.UniComboBox1.Text:= 'http://www.google.com';
 end;

thank