private void toolStripSplitPanel1_Click(object sender, EventArgs e)
{
SplitContainer sc = MakeSplitContainer(currentsplitter.Orientation == Orientation.Vertical ? Orientation.Horizontal : Orientation.Vertical, (currentsplitter.Name.Substring(3).InvariantParseIntNull() ?? 1000) + 1);
currentsplitter.Split(0, sc, MakeNode(GetFreeTag().ToStringInvariant()));
}