Adding multiple buttons to one graph

[daniel_moon16]

Is it possible to add more than one button directly to the chart?  right now I'm using:

chart4.addEventListener("rendered", function(eventObject, argumentsObject) { eventObject.sender.ref.drawOverlayButton({show:1, message:"Zoom"});} );
chart4.addEventListener("overlaybuttonclick", function(eventObject, argumentsObject){getCombo1("zoom");});

to implement changing graphs.

 

It seems like I can only implement one button on a single graph with this method.

 

Is there a better way to do it?

 

Thanks in advance.