Can somebody please tell me what's wrong with this code?

Local cCheckName AS String

Scan
   cCheckName = [.] + Alltrim(CheckBoxRules.Checkname) 
   With Thisform.Pages1._page1
        ? &cCheckName                 && evaluates to _Check1 of type object 
	&cCheckName..Addproperty('cSqlString',&Rules)    && Error
   Endwith
Endscan

I also tried &cCheckName.Addproperty('cSqlString',&Rules) with similar results.

TIA & BR

Peter