Update form properties after sub form close

This is sort of related to my earlier post.
I have form that launches a sub form via a button

Code:

Private Sub Edit_AddBtn_Click()

On Error GoTo Err_Edit_AddBtn_Click

    Dim stDocName As String

    Dim stLinkCriteria As String

    stDocName = "New Customer Popup"

    stLinkCriteria = "[CustomerID]=" & "'" & Me![CustomerID] & "'"

    DoCmd.OpenForm stDocName, , , stLinkCriteria

Exit_Edit_AddBtn_Click:

    Exit Sub

Err_Edit_AddBtn_Click:

    MsgBox Err.Description

    Resume Exit_Edit_AddBtn_Click

End Sub

The parent form has on it controls that make command buttons active/inactive based on the contents of a field

Code:

Private Sub Form_Current()



If IsNull(Me.EmailAddress) Or Me.EmailAddress = "" Then

    Me.SendMail.Enabled = False

    Else

    Me.SendMail.Enabled = True

End If

End Sub

What I have found is that if the field contents are changed in the sub form, and then the sub form is closed, the controls on the command buttons aren't updated.

I am using the requery command in the On Close event procedure of the sub form to update the parent form data (which works fine)

Code:

Private Sub Form_Close()

    Requery

End Sub

However the command button controls are still in the state they were prior to opening the sub form.

Does anyone know how I "refresh" the parent form to reflect the new state of the form contents.

Many thanks in advance.