System.Object
   System.Collections.ObjectModel.Collection<T>
      C1.Web.Wijmo.Controls.Base.Collections.C1ObservableItemCollection<TOwner,TItem>
         C1.Web.Wijmo.Controls.C1Gallery.C1GalleryItemCollection
   System.EventArgs
      C1.Web.Wijmo.Controls.C1Gallery.C1GalleryItemEventArgs
   System.Web.UI.Control
      System.Web.UI.WebControls.WebControl
         C1.Web.Wijmo.Controls.Base.UIElement
            C1.Web.Wijmo.Controls.C1Gallery.C1GalleryItem
         System.Web.UI.WebControls.BaseDataBoundControl
            System.Web.UI.WebControls.DataBoundControl
               C1.Web.Wijmo.Controls.Base.C1TargetDataBoundControlBase
                  C1.Web.Wijmo.Controls.C1Gallery.C1Gallery

Reference

C1.Web.Wijmo.Controls.4 Assembly