public static extern int SendMessage(IntPtr hWnd, TreeViewMessages msg, int wParam, ref TV_HITTESTINFO lParam);
public static extern void SendMessage(IntPtr hWnd, TreeViewMessages msg, int wParam, ref TVSORTCB lParam);
public static extern void SendMessage(IntPtr hWnd, TreeViewMessages msg, int wParam, ref TVINSERTSTRUCT lParam);