Someone

using System;
using System.Windows.Forms;

class TestForm : Form
{
	static void Main ()
	{
		Application.Run (new TestForm ());
	}

	public TestForm ()
	{
		ToolStrip ts = new ToolStrip ();
		
		ToolStripComboBox tscb = new ToolStripComboBox ();
		ts.Items.Add (tscb);
		Controls.Add (ts);
	}
}