private void Form1_Load(object sender, EventArgs e)
{
  CreateBarButtonItem();
}

private void CreateBarButtonItem() {

  // 創(chuàng)建右鍵菜單
  ContextMenuStrip contextMenuStrip = new ContextMenuStrip();
  // 添加 "執(zhí)行選擇" 菜單項
  ToolStripMenuItem execSelectedItem = new ToolStripMenuItem("執(zhí)行選擇");
  execSelectedItem.Click += ExecSelectedItem_Click; ;
  contextMenuStrip.Items.Add(execSelectedItem);
  // 關(guān)聯(lián)右鍵菜單與 TreeList 控件
  treeList1.PopupMenuShowing += TreeList1_PopupMenuShowing;
}

 private void TreeList1_PopupMenuShowing(object sender, PopupMenuShowingEventArgs e)
 {
     // 禁用自帶的右鍵菜單
     e.Allow = false;
 }

private void ExecSelectedItem_Click(object sender, EventArgs e)
{
  //處理“執(zhí)行選擇”事件邏輯
} 

private void Form1_Load(object sender, EventArgs e)
{
  treeList1.PopupMenuShowing += TreeList1_PopupMenuShowing;//自定義右鍵展示菜單
}

private void TreeList1_PopupMenuShowing(object sender, PopupMenuShowingEventArgs e)
{
  // 獲取右鍵菜單
  if (e.Menu is TreeListMenu menu)
  {
    // 添加自定義按鈕
    DXMenuItem execSelectedItem = new DXMenuItem("執(zhí)行選擇");
    execSelectedItem.Click += ExecSelectedItem_Click;
    // 將自定義按鈕插入到菜單的末尾
    menu.Items.Add(execSelectedItem);
  }
}

private void ExecSelectedItem_Click(object sender, EventArgs e)
{
  //處理“執(zhí)行選擇”事件邏輯
}