Can I use Silverlight 3 third party controls with Silverlight 4

Question

Recently I installed Silverlight 4 plugin and noticed that windowless mode now works correctly with FireFox. I quickly read SL4 release notes but cannot find answer.
Can I use SL3 controls (we are using a LOT of DevExpress and Infragistics controls) in SL4.

Answer 1

Its highly unlikely that you can. More likely you will need to use controls built for Silverlight 4 in a Silverlight 4 project. The reason being that Silverlight cannot load different versions of an assembly in to the same application. If the older controls use common SDK libraries that your application is using then there will be a mis-match in versions.

Answer 2

Thanks guys I successfully converted ALL my code to SL4.
It takes only one day, thought SL4 continues SL tradition to throw out weird and hard to debug errors like 'error in line 0 column 0'.

PS Performance of SL4 compared to SL3 is incredible!