public GUIMeshViewer AddMeshViewer(Rect rectangle, GUIElement parent, int id, string text)
{
IntPtr par = (parent == null ? IntPtr.Zero : parent.Raw);
return (GUIMeshViewer)NativeElement.GetObject(GuiEnv_AddMeshViewer(_raw, rectangle.ToUnmanaged(), par, id, text),
typeof(GUIMeshViewer));
}