Change size of checkbox in Excel

I want to create a checkbox control in my worksheet where I can re-size the dimensions of the checkbox, but I understand that is not possible when using the standard Excel ActiveX checkbox control.  I searched Experts Exchange to see what I could find on this topic, and found two approaches that sound good, but I'm not having any luck making them work.

One expert responded with the text quoted below. What he's saying makes sense, but I have no ideal how to "trap the Selection_Change event of the cell". I can put the Dingbats symbol in a cell, but not sure how to do the rest.

"You could alternatively create you own checkbox using empty and filled ballot box characters. These may be found with the Insert...Symbol menu item--empty it is Unicode 2610; checked, it is Unicode 2611. You can find it on the Miscellaneuous Dingbats submenu. As a font character, you can size it as you wish. To use it as a checkbox, you would trap the Selection_Change event of the cell, then change from one character to the other."

Another expert suggested this code for doing the task, but I don't understand what he's saying to do:

Create a Custom Property
'    (Declarations)
     Private yesno As Boolean

    Property Let Changed(yy As Boolean)
      yesno = yy
    End Property

    Property Get Changed() As Boolean
     Changed = yesno
    End Property

'In the Changed Events of the Control you want to track just paste the following code:

   Form1.Changed = True

Can some of the experts elaborate on the above approaches, or provide me with another method to create a checkbox that I can re-size?

Thanks!