Changing the back color of an Edit Box. Same applies to Text Box, Combo Box or Grid.
THISFORM.TEXT1.BackColor = RGB(255,255,255)
THISFORM.EDIT1.BackColor = RGB(255,255,255)
THISFORM.EDIT2.BackColor = RGB(255,255,255)
THISFORM.EDIT3.BackColor = RGB(255,255,255)
THISFORM.EDIT4.BackColor = RGB(255,255,255)
THISFORM.EDIT5.BackColor = RGB(255,255,255)
THISFORM.EDIT6.BackColor = RGB(255,255,255)
THISFORM.EDIT7.BackColor = RGB(255,255,255)
THISFORM.EDIT8.BackColor = RGB(255,255,255)