Map Softkey for All messages to open VITO SMS
 

I have searched high and low, but I cannot find the answer. All I want to do, is when I select "All Messages" in TF3d for it to open my VITO SMS-CHAT instead of the default sent items in outlook text messages. How can I remap that soft key? I have ssmapa, but it doesnt have a text messaging option specific remap. I believe there is a simple registry edit for this, but I am no expert. Any ideas??