[AccessD] Format Valuta

Hello Group,

in an If statement i want to format a currency field so that the Euro sign is shown in an unbound textbox.

I tried: 

If chbUitz = True Then
    Me!txtPrijs1 = Format([Forms]![frmExample]![txtTest], "Valuta")

Normally,    = Format([Forms]![frmExample]![txtTest], "Valuta")     
works as a control source.
Why doesnt it work now?

TIA


Pedro Janssen