Try to set the forecolor equal to the backcolor of the textboxes with one strike. For white background:

form.SetAll("forecolor",RGB(255,255,255),"textbox")

all textboxes should 'show' up as empty ( but they are not !)

to reverse:
form.SetAll("forecolor",RGB(0,0,0),"textbox")

or what was the color before

Giesbert