What tool are you talking about changing? SAS/Studio? Something else?
What would the BROWSE option do that is different that just expanding the list of members?
Should it show additional information about each member? if so what?
Should it open a new tab? A pop-up?
Or perhaps you want to improve performance on libraries with a lot of members? Perhaps by not trying to list all of the members at once. Say by limiting the number of members it shows to a single page with up/down more/less navigation to see the rest?