A digital interactive television set has a graphical user interface for displaying content from a plurality of different sources on its screen e.g. from digital satellite or cable broadcasts or through the Internet, the interface comprising: a focus region (16), and horizontally and vertically extending scroll bars (H, V) which each comprise a plurality of scroll bar elements that can be scrolled successively through the focus region, the scroll bar elements of the horizontal scroll bar signifying groupings of content sources. Elements of the horizontal scroll bar are scrolled individually into the focus region, and the scroll bar elements of the vertical scroll bar signify content sources which are included within a grouping thereof associated with the individual element of the horizontal scroll bar, so that the scroll bar elements of the vertical scroll bar can then be scrolled through the focus region to select a content source of the grouping. The scroll bar elements of the horizontal scroll bar comprise a three dimensional depiction of more than one of the content source groupings, and an individual one of the groupings may be selected from the three dimensional depiction for the focus region. The three dimensional elements are the horizontal scroll bar may comprise rectangular blocks that are rotatable about a common longitudinal axis.