Reg : F4 help in disable mode

hi,

I have a input field for which search help is assigned.

its working fine.

Now, my req is : I want this field to be in display mode.when the user presses F4 he should get a list of values...when he selects any value ...that should be selected in to the input field.

Same like code wizard...when user presses F4 ..he gets all the nodes and attributes...and he selct some node.....that will be selected in that input field .

any ideas plz

Regards

arjun