Check Boxes on Access forms are a common item.  In earlier versions of Access the dotted line around the interior of the check box when it has focus can be moderately annoying as it somewhat obscures the actual check in the box.  Here is how to make your check boxes appear more cleanly.  NOTE:  If dealing with tri-state check boxes the code gets a little more complex.
Overall Solution:  Use labels, control grouping and a few lines of code to remove that dotted line focus indicator.

First, over the check box add a label with a caption of a space (" ").  This prevents the label from disappearing when you click off of it.
Second, do an area select of the check box and label.  From the menu bar, click Format, Group.  This makes the check box and label a pair so you may change the design of your form as needed.
Third, in the OnClick event of the label add this line of code:  chkToggle = Not chkToggle .  This code will toggle between True and False.
<embed=snippet 197739>

This code will cycle between True, False and Null for a tri-state check box:
 <embed=snippet 197743>
DONE!

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Private Sub lblCheckBoxToggle_Click()
If IsNull(chkToggle) Then
    chkToggle = True
ElseIf chkToggle = True Then
    chkToggle = False
ElseIf chkToggle = False Then
    chkToggle = Null
End If
End Sub

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Private Sub lblCheckBoxToggle_Click()
chkToggle = Not chkToggle
End Sub