private void toolStripMenuItemInsertFunction_Click(object sender, EventArgs e)
{
TreeNode tnParent = this.treeView.SelectedNode;
DocSchema docSchema = (DocSchema)tnParent.Tag;
DocFunction docType = new DocFunction();
docSchema.Functions.Add(docType);
this.treeView.SelectedNode = this.LoadNode(tnParent.Nodes[3], docType, null, true);
toolStripMenuItemEditRename_Click(this, e);
}