public void CreateLine(NodeBase fromNode, NodeBase toNode)
{
if (fromNode.CanConnectLineAsParent() && toNode.CanConnectLineAsChild())
{
fromNode.AddChildNode(toNode);
toNode.ParentNode = fromNode;
ConnectLine line = new ConnectLine(fromNode, toNode, DestoryLine);
_lineList.Add(line);
}
}