Textbox in SubForm

[an]

Hi!

I have an unbound Form and subForm based in one table.
In Form I have a cboCenter to choose centers, based in T_Centers.
I would like in textbox in subForm to visualize the option choosed in
cboCenter.
In adition, I would like when open the Form the cboCenter don´t show us the
first line of the table but show us the option, only after click in cboCenter.

Thanks in advance.
an