Sorting Parameter values in SSRS Model based report

I've been able to get a drop down parameter list to sort by adding a new datasource, and avoid the model altogether.  I can then use T-SQL to pull my parameter dataset and specify a sort order in T-SQL.  Of course I have to use the pre-existing parameters that are already configured within the Report Builder parameters collection.  Also you have to remember that the mapping of the parameters needs to be pointed to my new dataset that is not using the model as its datasource.