IfcDoc.FormEdit.treeViewInstance_BeforeExpand C# (CSharp) Method

        private void treeViewInstance_BeforeExpand(object sender, TreeViewCancelEventArgs e)
        {
            TreeNode tn = e.Node;
            if(tn.Tag is SEntity)
            {
                SEntity ent = (SEntity)tn.Tag;
                LoadInstance(tn, ent);
            }

            e.Cancel = false;
        }