New Post: prism:Click.Command & Property Binding

I have a button that uses the PRISM Click binding:

prism:Click.Command="{Binding ABinding}"

On the same button I have a binding for the IsEnabled property:

IsEnabled="{Binding Path=CheckEnabled}"

The CheckEnabled property[in my ViewModel] does not get called. If I change the PRIMS click binding to a straight Command binding:

Command="{Binding ABinding}"

Then the CheckEnabled property gets called (during binding updates). What I would like t know is why the PRISM click command binding interferes with other bidnings on the control?

Peter