internal override IntPtr CreateWindow(IntPtr Parent, int X, int Y, int Width, int Height) {
CreateParams create_params = new CreateParams();
create_params.Caption = "";
create_params.X = X;
create_params.Y = Y;
create_params.Width = Width;
create_params.Height = Height;
create_params.ClassName=XplatUI.DefaultClassName;
create_params.ClassStyle = 0;
create_params.ExStyle=0;
create_params.Parent=IntPtr.Zero;
create_params.Param=0;
return CreateWindow(create_params);
}