Closing Events In MDI Panel?

Here's what I'm trying to do:I have a top level form which is an MDI container. I have a subform which contains property controls that might be used to make changes to "document" subforms. There is exactly one instance of the property form, which is either shown or hidden, but never actually closed.Show/hide from a menu seems easy enough: I have a menu item, which when triggered toggles the show/hide state and changes the "checked" state of the menu item (also used to determine whether the subform is currently shown).

The problem I'm having is that I also want to catch the "close" event for the subform, and cause that to hide the form and then cancel the close event.What actually happens is this: the event handler catches close events not just from the subform, but from the parent form as well. So I can get the function that I want, but it also prevents the parent application window from being closed.How do I catch just the subform event and not the parent form?Here's a representative section of the code that I have (bear in mind that I've been trying different things here, so there may be some odd things that I've broken):

Public Class Example
Private WithEvents PropertiesForm As New Properties()
Private Sub Example_Load(ByVal sender As System.Object, ByVal e As System.EventArgs)

[code].....