public void actionPerformed(ActionEvent event) {
    boolean enabled = false;
    KNode selectedNode = resourceTreeTable.getSelectedNode();
    if (selectedNode != null) {

      if (selectedNode instanceof ResourceNode) {
        ResourceNode resourceNode = (ResourceNode) selectedNode;

        if (resourceNode.getResourceType() == ResourceType.INTERFACE) {
          enabled = true;
        }
      }
    }
    Application.getInstance()
        .getProjectExplorer()
        .getMenu(ProjectExplorer.Action.MenuFileExportInterface)
        .setEnabled(enabled);
  }