lib/Ext/Sortable.js
function() {
        this.el.on(this.startEventName, this.onStart, this, {delegate: this.itemSelector, holdThreshold: this.getDelay()});
        this.disabled = false;
    }
function() {
        this.el.on(this.startEventName, this.onStart, this, {delegate: this.itemSelector, holdThreshold: this.getDelay()});
        this.disabled = false;
    }
Enables sorting for this Sortable.
This method is invoked immediately after construction of a Sortable unless
the disabled configuration is set to `true`.