void DeleteEvent(object param)
{
TreeNode node = (TreeNode)param;
if (object.Equals(node.parent, null))
{
return;
}
GEventStyle tl = node.parent.style;
GEvent parent = curTimline.Get(tl);
parent.Remove(curEvent);
node.parent.childs.Remove(node);
SetSelect(node.parent);
rootNode.isChange = true;
}