It's a bit different then mofux described above.
needed to change something.
Based on which Viewmode you are, you can set the visibility of controls.
the view modes are specified with:
facadeview.album
facadeview.filmstrip
facadeview.list
facadeview.largeicons
facadeview.playlist
facadeview.smallicons
so if you want a specific control to appear only, while for example in List view:
<control>
....
<description>some image or any other control, could also be a group</description>
<visible>facadeview.list</visible>
</control>
works from SVN 15491