imput to dialog box

Hi it's me again.

I have a question, I have a dialog box with two radio buttons...one for
metric & one for imperial. I have a pull-down list with a number of
different drawing scales which I would like to populate differently
depending on whether the metric or imperial radio button is selected. I have
no problem populating the list with either of these sets of scales but I
can't get them to change when I select the radio button I like. It appears I
can communicate to the dialog and back to lisp but can't communicate back to
the dialog again. How do I do this? I've tried a lot of different things and
read a few tutorials, but nothing seems to cover this.

While I'm at it I have another problem. I have a dialog box with an edit box
in it and an OK & cancel button. I can enter text in the edit box and hit
AUK and all's good. What I want to do, however, is enter text and hit AUK or
'enter' on the keyboard to achieve the same result. Does this have something
to do with the tile focus? How do I correct this?

Thanks in advance.

Chuck