I am using an MDI form with menu items.

I am using the following code to open a form when appropriate menu item is chosen. But I want to make sure if the user clicks on the same menu item multiple times, only one instance of the MDI child should be shown rather than mulitiple instance of the same (MDI child) form.

Dim NewMDIChild As New frmRateType
NewMDIChild.MdiParent = Me
NewMDIChild.StartPosition = FormStartPosition.CenterScreen
NewMDIChild.Show()

How can I restrict?

thanks
nath