制表位在具有自定义控件的窗体中不起作用

using System;
using System.Windows.Forms;

public class CustomControl : Control
{
    protected override bool ProcessDialogKey(Keys keyData)
    {
        if (keyData == Keys.Tab)
        {
            // 处理Tab键事件
            this.SelectNextControl(this, true, true, true, true);
            return true;
        }
        return base.ProcessDialogKey(keyData);
    }

    protected override bool ProcessTabKey(bool forward)
    {
        if (forward)
        {
            // 处理向前Tab键事件
            return this.SelectNextControl(this, true, true, true, true);
        }
        else
        {
            // 处理向后Tab键事件
            return this.SelectPreviousControl(this, true, true, true, true);
        }
    }
}