Refer checkbox by name in a loop

Hello! I'm using a loop with counter, wich increases by one each time. The idea is to go through many checkboxes, check their value and perform certain actions if it's "TRUE". However, I fail to refer to checkboxes:

MyObject = Trim("CheckBox") & Trim(Str(Counter))
MyValue = MyObject.Value()

As MyObject is a String, exel says : Runtime error '424' Object required.
How can I go through these checkboxes in a loop?
Many thanks!