If you want further explanation , you can email me  matrikaghimire26@gmail.com :)

private void tile_panel_A_TileStateChanging(object sender, Infragistics.Win.Misc.TileStateChangingEventArgs e)
{
e.Cancel = true;
tile_panel_B.clear();

//get the detail of tile as :
// Infragistics.Win.Misc.UltraTile  some_time= e.Tile;

// create new tile _tile
Infragistics.Win.Misc.UltraTile T = new Infragistics.Win.Misc.UltraTile();

//enter tile details and add controls to the tile

//add new tile to tile_panel_B
tile_panel_B.Tiles.Add(_tile);

}

I'm also facing same problem. It's sad to know they haven't provided solution for that. But , I think , You can use a trick. use 2 pannels A and B. place small tiles in pannel A and maximized tile in B. when some tile in A is maximized, remove previous tile from B and add the tile in B which is maximized in A. 

set width of A as you required for the small tiles width and set width of B as you required for large tile.

I've also not tested this, I'll inform you if I succeed.

Please inform if you get any other solution.

Thank you

We currently do not support this functionality.  If you want you may submit a feature request for this event on the link below : http://devcenter.infragistics.com/protected/requestfeature.aspx

Regards,

Stefaniya