public void OnNodeDeleteChildren(BTEditorGraphNode node)
{
if (node != null)
{
BTUndoSystem.BeginUndoGroup("Delete children");
int childIndex = 0;
while (node.ChildCount > 0)
{
BTUndoSystem.RegisterUndo(new UndoNodeDeleted(node.GetChild(0), childIndex));
node.OnDeleteChild(0);
childIndex++;
}
BTUndoSystem.EndUndoGroup();
}
}