Adding a horizontal separator in a MenuStrip

I can't seem to find any way to add a horizontal separator in a MenuStrip. Visual Studio complains Cannot add ToolStropSeparator to MenuStrip.

Any idea's how I can do this?

Thanks.

From stackoverflow

• I'm able to run code like this:

  this.menuMain.Items.Add(new ToolStripSeparator());
  

  without any trouble... What kind of error are you getting?

  Malfist : I am using the GUI Designer and it tells me when I try to do '-' that 'Cannot add ToolStripSeparator to MenuStrip'

  Malfist : That works when I add it to the MainForm.Designer.cs, thanks!

  Malfist : Actually that doesn't work. It shows up in designer, but not when I actually run the program...

  Malfist : I added mnuMain.Items.Insert(2, new ToolStripSeparator()); to get the desired effect.