In the chat visual structure is it possible to have a microphone icon within the message area? This is to support the user speaking their message as oppose to typing it via the app keyboard.
I have attached the Chat ControlTemplate. You can modify it according to the concrete requirements you have - just make sure to leave the elements which have "PART_" in their name in the template. The area with the entry and send button is the PART_InputAreaGrid
The command for sending the messages is ActualSendMessageCommand and used in the ChatEntry ReturnCommand as well as the ImageButton next to it.