@Override
    public void actionPerformed(@NotNull AnActionEvent e) {
      final PsiFile selection = (PsiFile)getTreeSelection(myTree);
      final PsiFile listSelection = (PsiFile)getListSelection();

      myManager.removeAssociation(selection, listSelection);
      myListModel.update(selection);
    }
@Override
    public void actionPerformed(@NotNull AnActionEvent e)