I have a web part zone that contains two web parts: Attachment Light Box Gallery and a custom Product selector. When the user selects a product in the product selector, I want the Attachment Light Box Gallery to show the images related to the selected product. I do not want to do a Response.Redirect, because I will lose other data the user has entered. This is the code I am using. I have confirmed it is reaching the att.ReloadData() method, but it does not load the new images. Any suggestions?

private void UpdateImageGalleryPath(TreeNode selected)
{
if(string.IsNullOrEmpty(AttachmentGalleryControlID))
return;

CMSWebParts_Attachments_AttachmentLightBoxGallery att =
ParentZone.FindWebPart(AttachmentGalleryControlID) as CMSWebParts_Attachments_AttachmentLightBoxGallery;

if (att != null)
{
att.Path = selected.NodeAliasPath;
// tried all of these individually & in combination
att.ClearCache();
att.ReloadData();
att.DataBind();
}
}