How to programmatically set the LIKE variable in a DoCmd open form filter (1 Viewer)

I need to set the Variable for the LIKE portion of a DoCmd form filter to an external value. If I use the filter without the LIKE it is no problem, that is, I can set the value of the Filter as "Last = Forms![frm_Hidden]![Hidden_txt0]", when using the LIKE I cannot get it to work, even though the value in the txt0 is X* where X is any alpha character. What do I need to do?????

"[Last] Like '*" & Forms![frm_Hidden]![Hidden_txt0] & "*';"