private void UpdateToolstipControls() { _currentlySelectedExternalTools.Clear(); _currentlySelectedExternalTools.AddRange(ToolsListObjView.SelectedObjects.OfType <ExternalTool>()); PropertiesGroupBox.Enabled = _currentlySelectedExternalTools.Count == 1; var atleastOneToolSelected = _currentlySelectedExternalTools.Count > 0; DeleteToolMenuItem.Enabled = atleastOneToolSelected; DeleteToolToolstripButton.Enabled = atleastOneToolSelected; LaunchToolMenuItem.Enabled = atleastOneToolSelected; LaunchToolToolstripButton.Enabled = atleastOneToolSelected; }