BusyIndicator and UserControl

Question

Hi,
I want to create a UserControl which contains a BusyIndicator.
In my MainPageBiew.xaml, I am loading data from the DB. THis time i want to show the BusyIndicator. And after loading data , i want to set the IsBusy to false.
How can i do this using MVVM.
Please help if anybody knows the answer

Thanks