I seem to have so much trouble with set focus.  Does it trouble anyone else?  
Maybe I dont understand what it does or maybe its the if /then I am using.  I
have a very simple pop up form. it has 2 enties and I want to be sure that
there is data in those fields before I close the form.
If it detects a null,  want it to stop and wait for input at the txtbox.  It
doesn't, it just closes form.  My guess is the if/then not the set focus but
I hope I will get other opinions.

Private Sub cmdToClosefrmRepairComplete_Click()
On Error GoTo Err_cmdToClosefrmRepairComplete_Click
If IsNull(txtDateRepairComplete) Then
   MsgBox (" You must have an Entry in 'Date Repair Complete'")
   Me.txtDateRepairComplete.SetFocus
   
End If
   

   DoCmd.Close

Exit_cmdToClosefrmRepairComplete_Click:
   Exit Sub

Err_cmdToClosefrmRepairComplete_Click:
   MsgBox Err.Description
   Resume Exit_cmdToClosefrmRepairComplete_Click
   
End Sub

I