private void mnuAddDialog_Click(object sender, EventArgs e) { if (_treeHelper.IsSystem(treeViewLibrary.SelectedNode)) { return; } var _newNode = _treeHelper.CreateNewNodeWindowedDialog(treeViewLibrary.SelectedNode); if (_newNode == null) { return; } treeViewLibrary.SelectedNode = _newNode; fastColoredTextBox.Focus(); }