code: private void menuNavigateMenuSelected(javax.swing.event.MenuEvent evt) {//GEN-FIRST:event_menuNavigateMenuSelected
      final TabTitle title = getFocusedTab();
      this.menuNavigateLinksGraph.setEnabled(title != null && title.getProvider().getEditor().getEditorContentType() == EditorContentType.MINDMAP);
    }
docs: GEN-LAST:event_menuNavigateLinksGraphActionPerformed