private void InitGUIElement(GUIHost gui_host, Element2D parent)
{
scroll_frame = new ScrollFrame(1234);
scroll_frame.Init(gui_host);
scroll_frame.Width = 450;
scroll_frame.RelativeHeight = -1f;
scroll_frame.Pane_Width = 400;
scroll_frame.Pane_Height = 10;
scroll_frame.X = -scroll_frame.Width;
scroll_frame.Y = 64;
ScrollFrame scrollFrame = scroll_frame;
scrollFrame.OnControlMsgCallback = scrollFrame.OnControlMsgCallback + new OnControlMsgDelegate(OnControlMsg);
layout = new VerticalLayout(12345);
layout.SetSize(400, 10);
layout.layoutMode = Layout.LayoutMode.ResizeLayoutToFitChildren;
scroll_frame.AddChildElement(layout);
scroll_frame.Visible = false;
parent.ChildList += scroll_frame;
}