Called whenever the view has been shown and the
transferable animations should be ended. This returns
the renderables to their original views.
function _endTransferableAnimations(item) {
        for (var j = 0; j < item.transferables.length; j++) {
            var transferable = item.transferables[j];
            for (var i = 0; i < this._renderables.transferables.length; i++) {
                if (this._renderables.transferables[i] === transferable.renderNode) {
                    this._renderables.transferables.splice(i, 1);
                    break;
                }
            }
            transferable.source.show(transferable.originalSource);
            transferable.target.show(transferable.originalTarget);
        }
        item.transferables = [];
        this.layout.reflowLayout();
    }