public void SetCheckBoxImageState(TreeNode InTreeNode, UInt32 InImageStateIndex)
{
var TreeViewItem = new TreeViewWin32.TVITEM();
TreeViewItem.hItem = InTreeNode.Handle;
TreeViewItem.mask = TreeViewWin32.TVIF_STATE;
TreeViewItem.stateMask = TreeViewWin32.TVIS_STATEIMAGEMASK;
TreeViewItem.state = InImageStateIndex << 12; // see INDEXTOSTATEIMAGEMASK
TreeViewWin32.SendMessage(this.Handle, TreeViewWin32.TVM_SETITEM, IntPtr.Zero, ref TreeViewItem);
}
protected override void OnHandleCreated(EventArgs e)
{
TreeViewWin32.SendMessage(this.Handle, TreeViewWin32.TVM_SETEXTENDEDSTYLE, (IntPtr)TreeViewWin32.TVS_EX_DOUBLEBUFFER, (IntPtr)TreeViewWin32.TVS_EX_DOUBLEBUFFER);
base.OnHandleCreated(e);
}