Adding Menuitems to Contextmenu doesn't work

[Kreisquadratur]

Below is s snippet of my code, which should add menuitems as a submenu
of an item in a contextmenu. But only the first time the contextmenu
opens the entrys are set correctly. I just don't know why or how to
solve this problem...

private void contextMenu1_Popup(object sender, System.EventArgs e)
{
contextMenu1.MenuItems[0].MenuItems.Clear();
Process[] myProcesses = Process.GetProcessesByName("IEXPLORE");
if (myProcesses.Length > 0)
{
contextMenu1.MenuItems[0].Enabled = true;
foreach (Process process in myProcesses)
contextMenu1.MenuItems[0].MenuItems.Add("(" +
process.Id.ToString() + ") : " + process.MainWindowTitle.ToString(),
new EventHandler(processmenu_clicked));
}
else
contextMenu1.MenuItems[0].Enabled = false;
}