The grid displaying the list of Test Lists, like many other grids, can be sorted by any column by clicking on the column header. You could give the items alphabetical names then sort by the name column.
I do not know of any way to otherwise specify a particular order of display.
If this is a feature you'd like to request, http://feedback.telerik.com/Project/117/ is a good place to do so. Please be sure to include some information on how and why you'd use this feature so that it can be properly prioritized.