I am bedeviled by by error 1924 "Active control is not an object". The error occurs in the second line of this code:

substitute="thisform.mypf.page"+ltrim(str(thisform.atpage))
if vartype(&substitute..activecontrol)='O'
&& put code here to ensure the valid for this control fires.

Can anyone tell me what I need to do to keep from generating error 1924 here. I don't know which control if any has focus. The old Foxpro objnum was much more useful to my way of thinking.