Thanks for your solution. It works well.
I have another question, if I want to display the live data always from Left to Right. It means that when the data fills the screen the first time, the live data restarts from the left side of the screen, until it fills the screen the second time, then it repeat the same action: starts with left side of the screen, ends with the right side of the screen ...
When I have a pause, I can see all history by a scroll gesture.
I changed the Max and Min value of the Axis X for this moment to resolve this problem, but I don't think it's a good solution.
Do you have any other ideas about it?