how to do the Click event on each bargraphs or pie chart using dojo

I have bar graph and pie chart using dojo gra开发者_如何学编程phs.

I need to keep the click event on each bar and pie chart slice to get the value of that particular slice or bar?

This stuff is actually documented:

• The official doc: http://dojotoolkit.org/reference-guide/dojox/charting.html#chart-events
• The test for events: http://archive.dojotoolkit.org/nightly/dojotoolkit/dojox/charting/tests/test_event2d.html