Access Eva() changing Control properties

Hey there.
I have a very big problem (hopefully easy) problem in VBA -> Access2000 ...

I have 50 Controls (textfields) named block1 --- block50 .. I have the number and want to change the caption, background etc....


but the following line will not work:

Eval ("Forms!Matrix.block20.BackColor = 65535")

Nomarly the "20" comes from a string var. This command is executed but nothing changes (Without eval i works)... When I change 20 to 53 (not in the form) I get the mess, that this control
is not there ....

Does somebody have an idea why I´m so stupid ?? :-)

bye,
daniel