Panel Won't Show When Called From MenuStrip

Question

I have a Panel called Panel_Manage_Calculations on a Form called Criteria. I have the visible property to a default of False. When I call it from my MenuStrip called MenutStrip_Main with this code:

Private Sub ManageCalculationsToolStripMenuItem_Click(sender As Object, e As EventArgs) Handles ManageCalculationsToolStripMenuItem.Click
    Criteria.Panel_Manage_Calculations.Show()
End Sub

It does not show. But if I put a button on Criteria and use this code:

Private Sub Button4_Click(sender As Object, e As EventArgs)
    Panel_Manage_Calculations.Show()
End Sub

It will show.

The only other object on Criteria is a DataGridView.

How can I get Panel_Manage_Calculations to show when called from MenutStrip_Main?

Additional Info

The only other code that might run before I click is:

Private Sub AddToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MenuItem_Criteria.Click
    For Each mdiChild As Form In Me.MdiChildren
        If mdiChild.Name = "Criteria" Then
            mdiChild.Activate()
            Exit Sub
        End If
    Next
    Dim frmClientConfig As New Criteria
    frmClientConfig.MdiParent = Me
    frmClientConfig.Show()
End Sub

Answer 1

Your MenuItem Click might not be hooked up correctly for instance, the Handles... clause might refer to an older name or it might simply be disabled. If the event is not firing, it is a menu thing. Try creating a new menu entry for the code.

EDIT

If the event is not firing it is likely because a) the menu item is not enabled (PERHAPS) it gets disabled in code, b) it lacks a HANDLER which seems not to be the case or C) something ELSE has that handler attached or D) the wrong form is referenced

EDIT EDIT

Ok, so we have multiple MDI forms. Based on the AddToolStripMenuItem, this is how it should look:

Private Sub ManageCalculationsToolStripMenuItem_Click(sender As Object, _
        e As EventArgs) Handles ManageCalculationsToolStripMenuItem.Click

        frmClientConfig.Panel_Manage_Calculations.Show()
End Sub

Criteria is the form name (Class), the instance name is frmClientConfig. You will need to rework how this form is handled:

    private frmClientConfig As Criteria      ' at the top of the MDI parent

In the menu Add click:

   frmClientConfig = New Criteria
   frmClientConfig.MdiParent = Me
   frmClientConfig.Show()

this is needed so that the menu click will know what a frmClientConfig is. The problem was that you were issuing the Show to the class not the instance (which seems like it should throw an error). BEWARE of where NEW is supposed to be used!