In the Refnum palette, there is a Data Log File Refnum. Put that on your front panel. Now drag a U32 control into it. You can customize the U32 before dragging it in to make it appear there is nothing in the refnum control.
There are only two ways to tell somebody thanks: Kudos and Marked Solutions Unofficial Forum Rules and Guidelines "Not that we are sufficient in ourselves to claim anything as coming from us, but our sufficiency is from God" - 2 Corinthians 3:5