Do you mean prevent the form from closing if the field has no value and have the entire field flash?
If so give this code a try (modify for your needs):

Details

Private Sub Form_Timer()

    Static counter As Long
    
    counter = counter + 1
    
    If counter Mod 2 = 0 Then
        MyValue.BackColor = RGB(255, 0, 0)
    Else
        MyValue.BackColor = RGB(255, 255, 255)
    End If
    
End Sub

Private Sub Form_Unload(Cancel As Integer)

    If IsNull(MyValue) Or MyValue = "" Then
        Me.TimerInterval = 700
        Cancel = True
    End If
    
End Sub
Copy

Note: Leave the Timer Interval at 0 in the Property Sheet.

Thank you very much Kevin!

I just have to untangle some of my shots in the dark here and will be back, but i am very confident in your work.

Best Regards,
-Bruce

Flashing Text

@ Kevin - Worked great, just tweaked a bit so when user clicked in the field they were supposed to fill in it brought it back to "normal"!

@ Alex - Thank you for providing the link to the extended cut. I thought that might have the additional info i was looking for but on YouTube i just couldn't find it.

Hi Bruce
Happy that you have it working. Just a note - Be careful, for blinking fields may cause seizures for some people.

John

Excellent point. I will change it to some color other than red, as if i recall, red is the worst for that, and give it a relatively slow rate. You would have thought i would have at very least remembered that scene in "The Andromeda Strain"...

And btw, i am dealing with a person who had seizures in his younger days, so your advice is very much appreciated-