Sivlerlight Report Viewer when choosing multiple items for a paremter shows ValueMember not DisplayMember

[Michael]

Using the silverlight reportviewer and opening a report and looking at the parameter section, if it's a multiselect list when i click the dropdown I see the DisplayMember values (let's say Red, Blue, Green) and I can select the ones I want, but when the dropdown goes back up it shows a list of the ValueMembers ( 1,2 instead of Red, Blue -- when I selected Red, Blue)

Is there a setting I am missing in Silverlight or in the report to fix this?

(v 4.1.10.921 )