public static void HideCheckBox(this TreeNode node)
{
TreeViewExtensions.TVITEM tVITEM = default(TreeViewExtensions.TVITEM);
tVITEM.hItem = node.Handle;
tVITEM.mask = 8;
tVITEM.stateMask = 61440;
tVITEM.state = 0;
TreeViewExtensions.SendMessage(node.TreeView.Handle, 4415, IntPtr.Zero, ref tVITEM);
}
private static extern IntPtr SendMessage(IntPtr hWnd, int Msg, IntPtr wParam, ref TreeViewExtensions.TVITEM lParam);