private void CreatePlaceholder(FormsTreeView treeView, TreeNode node, PlaceholderLocation placeHolderLocation)
{
if (lastPlaceholderNode == node && lastPlaceholderLocation == placeHolderLocation)
{
return;
}
RemovePlaceHolder(treeView);
lastPlaceholderNode = node;
lastPlaceholderLocation = placeHolderLocation;
placeHolderGraphics = treeView.CreateGraphics();
DrawPlaceHolder(node, placeHolderLocation, treeView.CreateGraphics());
}