Hi Lorenzo,
I am not exactly sure why your example doesn't work, but it has something to do with adding the chart to the page. I played around with it a bit and compared it to a Makit example I had previously done and got it to work by changing the last few lines to this:
var page = new sap.m.Page({ title: "My First MAKit Chart", content: [ oChart ] }); var app = new sap.m.App(); app.addPage(page); app.placeAt("content");
You can see the who thing here: JS Bin - Collaborative JavaScript Debugging
Perhaps someone with more insight can explain exactly why this is the case.
Hth,
Simon