Ext.onReady(function() {
    // Context Menu
    var menu = Ext.create('Ext.menu.Menu', {
    items : [{
        text : 'Copy',
        handler : function() {
        // Selection is not available here
        console.log("On Context menu item:" + window.getSelection().toString());

        }
    }],
    listeners : {
        mouseenter : function() {
        // Selection is not available here
        console.log("Enter menu render: " + window.getSelection().toString());
        },
        activate : function () {
        // Selection is still available
        console.log("Activate Context menu render:" + window.getSelection().toString());
        }
    }
    });

    // Bind to contextmenu event listener
    Ext.getDoc().on('contextmenu', function(ev) {
    menu.showAt(ev.getXY());
    ev.stopEvent();
    // Selection is available
    console.log("On Context menu :" + window.getSelection().toString());
    });
});