Scrolling a Y-axis of a Graph


I am trying to build a plugin based on the graph panel. My question has to do with the y-axes.
Would it be possible to scroll in a y-axis, and in this way making my data zoom in or zoom out?

What i am currently trying to do, is finding the html code of the y-axis and binding the “onmousewheel” property with my function, so that an event can be created whenever i am scrolling. The problem is that the event is taking place anywhere in the panel and not only on the y-axis.

Thank you in advance!