Which dll has 'BusyIndicator' for silverlight?

Question

I have installed Nov '09 silverlight 3 toolkit. Referenced System.Windows.Control from C:\Program Files\Microsoft SDKs\Silverlight\v3.0 Libraries\Client\System.Windows.Controls.dll

but when I compile my code I am getting "Error 6 The type or namespace name 'BusyIndicator' does not exist in the namespace 'System.Windows.Controls' (are you missing an assembly reference?)"

I opened the dll in object browser and I could not find the busyindicator either. Could some one please tell me which dll has the Busy Indicator?

I found the following link regarding the same issue but did not say which dll has this class.

Thanks,