Using Visual Studio 2012
Added an MDI Form to project which creates a bunch of default menu items and then added the following code for the File/Open menu item:
Public Class MDIParent1
Private Sub OpenFile(ByVal sender As Object, ByVal e As EventArgs) Handles OpenToolStripMenuItem.Click, OpenToolStripButton.Click
Dim frm As New Form1
With frm
.MdiParent = Me
.Show()
End With
End Sub
End Class
In another form, Form1, set KeyPreview = True and put in this code:
Public Class Form1
Private Sub Form1_KeyUp(sender As Object, e As KeyEventArgs) Handles Me.KeyUp
If e.KeyCode = Keys.Enter Then
MsgBox("enter pressed")
End If
End Sub
End Class
Now, if you launch the MDI form and click the File menu (or ALT+F) then scroll down using arrow keys to Open and hit Enter on the keyboard, it launches Form1 but fires KeyUp(). In my actual application this ends up launching another child form to Form1 and I need to suppress the Enter key from the MDI menu launch but can't figure out how to do that.