@Override
      protected LightToolWindowManager getOppositeManager() {
        AbstractToolWindowManager designerManager = DesignerToolWindowManager.getInstance(myProject);
        AbstractToolWindowManager paletteManager = PaletteToolWindowManager.getInstance(myProject);
        return myManager == designerManager ? paletteManager : designerManager;
      }
@Override
      protected LightToolWindowManager getOppositeManager()