[AccessD] Passing query "Between" date values into a form

Hi all,

The form I built is based on a query, and in that query I use 
the simple "Between [Date from:] And [Date to:]". 

What I want to do is to pass the values of the two parameters
into a textbox in the heading of the form so if the dates parameters are e.g.  
01/01/2011 and 31/01/2011 , to be displayed them in the form..

I try ControlSource: =[Date from:] & “ “ &[Date to:]
It works in a report but not in the form


Many thank’s
/kostas