How Do You Switch To Your Other Line When Another Call Comes?

[deadwrong03]

I had this issue on my touch pro 1, and now with the tp2 if your on a phone call and another call comes in on your other line how do you click over, and then when that call is over go back to the line you started on originally?

like when i have a call coming in i can slide to answer to put the first call on hold and answer the new incoming call, my problem is clicking back to the first call how do you do it? the touch send button doesnt seem to work is there anything else i can do to click back over to the original call?