The RadTreeMap creates the TreeMapItems from upper-left to lower-right (or left-to-right on horizontal and up-to-down on vertical) from "Largest to Smallest". I have a client that wanted the control to sort by "Smallest to Largest". 

As per http://www.telerik.com/forums/treemap-reverse-treemapitem-order

I was informed that this functionality is not supported. I'd like to request that this be possible. 

Thanks you.