how to show 0.00 value when textvalue=Previous(textbox value)

hi all,

   i have an expression like =(Fields!adjustment.Value) whose value is 0.00 for all the rows

so, i decided to show 0.00 only on top row..so in visibility(show/hide) i kept the expression as

=(Fields!adjustment.Value = Previous(Fields!adjustment.Value))

for all other textboxes this type of formuls working good. since this Fields!adjustment.value=0.00, its not showing in first row also...for all the rows i'm getting blank.

my expectation is on the first row i should get 0.00 and rest rows as blank..

pls help ,its urgent

thanx in advance..

lucky