When saving the "state" of the tiles, I need to know the content of the tile (component), even if it's just an ID that I assign myself. 

I'm making a configurable dashboard where a supervisor can make a dashboard for a specific work center out of a set of available tiles (components).  When the supervisor has resized, and dragged/dropped the tiles (components in the tiles) where they want them, I need to save the state of the tile (using colspan, rowspan, and order AND ID).  I think it would be simple enough so that if the "TileLayoutState", contained the "ID" of the content (in my case a component) when saving state, I could associate the component with the tile being saved.  As it stands, I can save the order of the tiles, but I have no idea what's in them when they're re-arranged.   It appears if a collection of tiles is used, the underlying order of the items in the collection is not updated when a drag/drop is performed. 

Adding the ability to know the tile content of of a tile via an ID would make this control so much more powerful.  

Also in my case I would like the ability to add custom buttons in the Tile Header, not just the standard window buttons like Close, Minimize, and Maximize.  Perhaps the tile item could expose one or more Template areas within the tile header to facilitate this.  Then one could specify any content there they wished.  What ever space is remaining in the Tile item could be the region where a user could "grab" the Tile and begin the movement operation.  It might even be nice to some style this remaining header regions to indicate that it is the area to user for moving it.