How to change state in spry when filter is selected

Hello,

I'd like to find a way to change the region state when a filter is applied to it. I am using an XML data set that is large and when a filter is selected there is a noticeable delay. I would like the Loading state to appear when a filter is selected or at least hide the region till it is done. Anyone know how to do this? I have tried a number of methods and have not been successful.

Thanks!

David