How do I convert a mono clip (already on the timeline) to a stereo clip?

I want to convert a clip on the timeline from Mono to Stereo.  I cannot for the life of me figure it out.  I have tried "Edit Clip in Adobe Audition" converted it to stereo there, and saved it, but it doesn't change the clip on the timeline. 

I figure there must be some way to change the properties of that specific audio track in my sequence, but I'm not seeing how to do that.

thanks,

Danny