ExtJs 4: contextmenu

var menu = new Ext.menu.Menu( {

    margin: '0 0 10 0',
    //defaults:{  
      //  iconAlign: 'top' // <--- we change the icon position  
    //},
    floating: true, 
    items: [{                        
        text: 'buscar amigos',
        iconCls:'back',
        handler: function(){
                alert('me apretaron'); 
        }      
    },{
        text: 'regular item 2'
    },{
        text: 'regular item 3'  
    }]
}); 

Ext.get("black_square").on("contextmenu",function(e,t) {
                    e.stopEvent();
                    menu.showBy(t);
                    return false;
                })
​

test Online:

http://jsfiddle.net/qGcHV/2/

test Online 2 (pasando Datos):

http://jsfiddle.net/qGcHV/5/

con jQuery:

http://jsfiddle.net/ric47121/GX7Yc/

http://scriptinside.blogspot.com.ar/2011/02/capturar-click-derecho-con-jquery.html