casper drag&drop not working with leaflet

gistfile1.js

//==============================================================================
// Casper generated Thu Feb 14 2013 18:15:16 GMT+0100 (CET)
//==============================================================================

var x = require('casper').selectXPath;
var casper = require('casper').create();
casper.options.viewportSize = {width: 1615, height: 964};
casper.start('http://leafletjs.com/');

casper.then(function() {
    this.mouse.down(490, 66);
    this.mouse.move(1102, 680);
    this.mouse.up(1102, 680);
});
casper.wait(1000);
casper.then(function() {
    this.captureSelector("screenshot1.png", "html");
});

casper.run(function() {this.test.renderResults(true);});