code: public void onUpdateCategoriesTree(List<CmsCategoryTreeEntry> categoryTreeEntry, List<String> selectedCategories) {
  
          m_galleryDialog.getCategoriesTab().updateContentTree(categoryTreeEntry, selectedCategories);
      }
docs: Will be triggered when the tree is selected.<p>
  
  @param categoryTreeEntry the category root entry
  @param selectedCategories the selected categories