Help Needed in passing values to silverlight webpart dynamically from another webpart

Hi All,

 We have a sharepoint application in which  the default page contains two webparts. One webpart is a silverlight webpart containing a TreeMapControl and another is a simple webpart containing radio buttons. Now our requirement is to bind the tree map control dynamically with appropriate data(which comes from the DB) according to the radio button selected .In this scenario, can we pass parameters during runtime to silverlight webpart i.e to XAML.CS file so that we can bind the data to silverlight treemap? Or is there any way to call a method that was written in XAML.CS from the 2nd webpart??? Or Kindly suggest whether  there is any other way to handle this scenario.

Thanks