Treat it as a normal plant. Let it grow. It will usually become a low branching plant which is good for a pot. By fully rooted is it leafed out and has a rounded tip or is it a cut off remains of the bottom of a grafting. If so, as long as it stays hard and green, it should start new branches off of the sides of the stem. Bill

It's just the cut off remains from the bottom of the grafting. I removed the failed graft about 5 days ago. Its starting to get callused arount the edge. The center of the cut stem is staring to sink in a bit.
Thanks-

Don't give up on the plant quickly. It may take some time for new branches to form. Look for bulges on the side of the stem. They may even occur down near the soil line. I would seal the open end with latex caulk to make sure water doesn't get in there and promote rot.
Mike

ok, great thanks for the tips.