There are some wrong icons in RadTreeList with MetroTouch skin, these icons appears with the option ButtonType= ImageButton on the TreeListEditCommandColumn, you can see it on your own demos http://demos.telerik.com/aspnet-ajax/treelist/examples/dataediting/net35automaticdataediting/defaultcs.aspx with the MetroTouch skin enabled.
Greetings.
Greetings.