ContextMenuStrip does not resize

When I change the text ToolStripLabel

in my context menu, the context menu does not automatically change as it was supposed to be when I change the text of the menu item.
It looks like then:

How can I resize the context menu correctly?
I could change the text of the real menu item, but I see this as a messy solution.

Test form: (use the left mouse button, left and right)

using System.Drawing;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1: Form
    {
        private ToolStripLabel menuLabel;

        private void CreateNewContextMenu()
        {
            ContextMenuStrip = new ContextMenuStrip();

            // label
            menuLabel = new ToolStripLabel("hello");
            menuLabel.ForeColor = Color.Blue;
            ContextMenuStrip.Items.Add(menuLabel);

            // items
            ContextMenuStrip.Items.Add("Test");
            ContextMenuStrip.Items.Add("Cut");
            ContextMenuStrip.Items.Add("&Copy");
            ContextMenuStrip.Items.Add("&Paste");
            ContextMenuStrip.Items.Add("&Delete");
        }

        protected override void OnMouseClick(MouseEventArgs e)
        {
            CreateNewContextMenu();
            menuLabel.Text = "hello world hello world hello world";
            Point p = PointToScreen(Point.Empty);

            // left
            if (e.X < ClientSize.Width / 2)
                ContextMenuStrip.Show(p.X + 8, p.Y + 8);
            // right
            else
            {
                ContextMenuStrip.Items[1].Text = menuLabel.Text;
                ContextMenuStrip.Show(p.X + ClientSize.Width - 8, p.Y + 8);
            }

            base.OnMouseClick(e);
        }
    }
}