Adjust Pie Chart Slice Popup to Canvas Size

[hel...@foursquare.com]

I made a regular pie chart and I want a lot data to show up when I hover over a slice of the pie chart. For most slices all the data shows up, but for slices closer to the edges of my canvas the popup gets cut off by the canvas. I tried adjusting the size of the canvas to make up for this, but that makes my page look awkward. Is there any way to make the popup extend down instead of having it get cut off by the canvas?