Forms Check/Uncheck CheckBoxes

I have a form that has multiple checkboxes and would like to set a button to check all and a button to uncheck all. I have searched and managed to come up with this (which I think is on the edge of being correct):

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Where am I going wrong?

Just in case the information is necessary the form I am using is named frmFields and the CheckBoxes are named chbx11 through chbx30 (there are 20 of them).

I'm getting Run-time error '438'

Object doesn't support this property or method.

I think I forgot to consider other controls in your form...

Lets try this code...

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Okay, from another thread where I asked a similar question I managed to come up with the following (and it works):

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I actually got this before I saw your most recent post; however, your post did jog my memory so I do appreciate it. I do have another question though:

What is the difference in what I found as opposed to what you recently posted? Is one better than the other?