@NotNull @Override
  protected LibraryTable.ModifiableModel getTableModifiableModel() {
    final LibraryTable selectedTable = (LibraryTable)myLibraryLevelCombobox.getSelectedItem();
    return myContext.getModifiableLibraryTable(selectedTable);
  }
@NotNull @Override
  protected LibraryTable.ModifiableModel getTableModifiableModel()