asynchronous loading user controls

I have 3 user controls that I have to load at the same time.  They each contain a gridview that pulls data from the database.  They are doing a "delay" load of the data so there is a progress bar template that shows that the data is loading however the first gridview fires and loads, then the second, then the third and I need them to all fire at the same time.  Any ideas? 
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