Access 2007 lost focus event

I am trying to use the Lost Focus event to validate if a field is null or not. After I display the message box I want to set the focus back on the same field, but the code I have moves to the next field.

I have attached the code. Any assistance in pointing out what I'm doing wrong would be great.

Thanks.
Private Sub CustId_LostFocus()
 
Dim varLength As Variant
varLength = Len(CustId.Value)
 
If IsNull(varLength) = True Then
    MsgBox ("You must enter a Cust ID.")
    CustId.SetFocus
    Exit Sub
End If
 
End Sub

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ochnessAsked:
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thenelsonCommented:
After the lost focus event completes, the keystroke that moved the focus (Tab, Enter, etc) or the mouse click completes. This occurs after the CustId.SetFocus command. So that command has to be placed outside of and after the lost focus event. You can use the form timer event for this:

Private Sub CustId_LostFocus()
 
Dim varLength As Variant
varLength = Len(CustId.Value)
 
If IsNull(varLength) = True Then
    MsgBox ("You must enter a Cust ID.")
    Me.TimerInterval = 1
    Exit Sub
End If
 
End Sub

Private Sub Form_timer()
Me.TimerInterval = 0
CustId.SetFocus
End Sub
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Chuck WoodCommented:
You can use the Enter event of the control the form moves to after CustId (called NextControl in the snippet) to trigger the event. Also, you can use the value of the field to test for nulls and just spaces and zero-length strings as shown in the snippet, without introducing another variable.
Chuck

Private Sub NextControl_Enter()
    ' If CustId is blank,
    If IsNull(CustId.Value) Or Len(Trim(CustId.Value)) = 0 Then
        ' warn the user and set the focus to CustId
        MsgBox ("You must enter a Cust ID.")
        CustId.SetFocus
    End If
End Sub

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ochnessAuthor Commented:
This was so long ago, but  I believe this did the trick.
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