stop excel from evaluating a formula while runing a code

Hi all,

I'm trying to run a code in a semi-complex workbook (with UDF's and other procedures) and am encountering a problem: when the execution of my code comes to a point where its changing a cell formula, the vba window jumps to an UDF and goes through it. Is there a way to stop that from hapening? I tried enableevents but had no luck.

Thanks