private void OnRemoveImporterProcess(T importer)
 {
     UndoHelper.CustomImporterUndo(Data, UndoHelper.UNDO_DELETESETTING);
     CustomImporterSettings.Remove(importer);
     Initialize();
     EditorGUIUtility.keyboardControl = 0;
 }
 private void OnAddImporterProcess(T importer)
 {
     UndoHelper.CustomImporterUndo(Data, UndoHelper.UNDO_ADDSETTING);
     CustomImporterSettings.Add(importer);
     Initialize();
     EditorGUIUtility.keyboardControl = 0;
 }
        protected override void Draw()
        {
            UndoHelper.CustomImporterUndo <T, U>(Data, UndoHelper.UNDO_CHANGESETTING);

            EditorGUILayout.BeginVertical();
            {
                Header();
                Main();
            }
            EditorGUILayout.EndVertical();

            CheckIsContextClicked();
        }