private void InitializeComponents() { Quit_MenuItem.Activated += QuitMenuItem_OnActivated; SaveChanges_MenuItem.Activated += SaveChangesMenuItem_OnActivated; ConnectDB_MenuItem.Activated += ConnectDBMenuItem_OnActivated; DisconnectDB_MenuItem.Activated += DisconnectDBMenuItem_OnActivated; Execute_Button.Clicked += ExecuteButton_OnClicked; var cellText = new CellRendererText(); Queries_ComboBoxText.PackStart(cellText, false); Queries_ComboBoxText.AddAttribute(cellText, "text", 0); }