You can access a GalleryControl's embedded gallery via the GalleryControl.Gallery object.
Use this property to customize the gallery and add gallery groups (BaseGallery.Groups) to it. After gallery groups are added, you can add gallery items to the groups via the GalleryItemGroup.Items collection.
System.Object
System.MarshalByRefObject
System.ComponentModel.Component
BaseGallery
StandaloneGallery
GalleryControlGallery
PopupGalleryEditGallery