Any event listener for changes made to a single graphic of the map.graphics layer?

LYW

For example in this webpage (http://help.arcgis.com/en/webapi/javascript/arcgis/demos/graphics/graphics_contextmenu.html):

After I chose a shape to edit, how do I use a listener to listen to the event - after a single action to change a vertex or after finished editing (click elsewhere in the map)? In simple term, I want a listener to listen to changes made to the shape.

dojo.connect(???, "???", function(evt) {

 });