Since Setfocus wont work on LostFocus event how can I make completion of two fields compulsory on a form

I have a form where users enter details about a job that needs to be done. In some cases there is a charge (ChargeAmount field) and if they enter a charge amount they need to enter ChargeDetails field too. It's not happening so I tried setting the On LostFocus event to check
IF IsNull(ChargeDetails) and Not IsNull(ChargeAmount) THEN
    MsgBox "You must enter a text",,"Text Required"  

The message appears but the focus does not return to the field. Is there any other way of forcing this?
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Anders Ebro (Microsoft MVP)Microsoft DeveloperCommented:
I've always found it the easiest (And by far the most reliable) to run validation in the FORMS beforeupdate event. This event runs right before the record as a whole, is committed to disk.

Private Sub Form_BeforeUpdate(Cancel as Integer)
IF IsNull(ChargeDetails) and Not IsNull(ChargeAmount) THEN 
    MsgBox "You must enter a text",,"Text Required"   
    Cancel=True 'This line stops the commit to disk.
End Sub

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Rob4077Author Commented:
Yep, that will do it. Forgot about the Form Update events. Thanks
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