ContextMenu does not work in DataGridView

[Steve Richter]

I cant get a contextmenu to popup in the context of a datagridview. It
pops up in the ListBox, and in the form itself. But not the
DataGridView. How could that be?

here is my code:

using System;
using System.Componen tModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows. Forms;

namespace demo_DataGridVi ew2
{

public partial class Form1 : Form
{
DataGridView mGrid1 = null ;
ContextMenu mContextMenu = null;
ListBox mListBox1 = null;

public Form1()
{
this.AutoScaleM ode = System.Windows. Forms.AutoScale Mode.Font;
this.Text = "Form1";
this.Width = this.Font.Heigh t * 40;

mContextMenu = new ContextMenu();
mContextMenu.Po pup += contextMenu_Pop up;

mListBox1 = new ListBox();
mListBox1.Paren t = this;
mListBox1.Locat ion = new Point(10, 30);
mListBox1.Heigh t = this.Font.Heigh t * 5;
mListBox1.Width = this.Font.Heigh t * 30;
mListBox1.Items .Add("line 0");
mListBox1.Items .Add("line 1");

mGrid1 = new DataGridView();
mGrid1.Parent = this;
mGrid1.Location = new Point(10, 120);
mGrid1.Height = this.Font.Heigh t * 5;
mGrid1.Width = this.Font.Heigh t * 30;
mGrid1.ColumnCo unt = 3;
mGrid1.AutoGene rateColumns = true;

string[] row1 = new string[3] {"col1", "col2", "col3"} ;
string[] row2 = new string[3] { "col1", "col2", "col3" };
mGrid1.Rows.Add (row1);
mGrid1.Rows.Add (row2);

this.ContextMen u = mContextMenu;
mListBox1.Conte xtMenu = mContextMenu;
mGrid1.ContextM enu = mContextMenu;
}

protected void contextMenu_Pop up(System.Objec t InSender,
System.EventArg s InArgs)
{
mContextMenu.Me nuItems.Clear() ;
if (mContextMenu.S ourceControl == this)
{
mContextMenu.Me nuItems.Add( new MenuItem("form menu item")) ;
}
else if (mContextMenu.S ourceControl == mGrid1)
{
mContextMenu.Me nuItems.Add( new MenuItem("grid menu item")) ;
}
else if (mContextMenu.S ourceControl == mListBox1)
{
mContextMenu.Me nuItems.Add(new MenuItem("ListB ox menu item"));
}
}

} // end class Form1
} // end namespace demo_table