or
foreach (ImageGalleryItemBase oItem in rdPics.Items)
{
oItem.Attributes.add("class", "MagicZoomPlus");
}

<LabelsAppearance DataFormatString="htt" RotationAngle="0" /><TooltipsAppearance BackgroundColor="#ffffff" Color="#5ab7de"> <ClientTemplate> <div><b>#=category#</b></div> <div>$#=value#</div> </ClientTemplate></TooltipsAppearance>