private void NewMessageEntry_Completed(object sender, EventArgs e)
{
string text = (sender as Entry).Text;
(sender as Entry).Text = "";
Message message = new Message(0, text, DateTime.Now, _conversation.member1.Id == User.Id);
_conversation.messages.Add(message);
stack.Children.Add(CreateButton(message, message.IsFromMember1));
_localData.AddNewMessage(message, _conversation);
}
