function() {
        var me = this,
            copy = new this.self(me.initialConfig);

        copy.add(me.keys, me.items);
        return copy;
    }
function() {
        var me = this,
            copy = new this.self(me.initialConfig);

        copy.add(me.keys, me.items);
        return copy;
    }
function ( ) { var me = this , copy = new this . self ( me . initialConfig ) ; copy . add ( me . keys , me . items ) ; return copy ; }
Creates a shallow copy of this collection
@return {Ext.util.MixedCollection}
@since Ext 1
Creates a shallow copy of this collection