Wait to show grid until images are downloaded

Like many of you, I've recently created a Roku Channel based on the git examples and tutorials on Roku's site. I have it working, and now it's time that I start to make things look/act more professional. 

Does anyone know a way to not show the grid view of thumbnails until all the thumbnails have been downloaded? Currently my channel takes a few seconds to load the thumbnails and it looks cheap.

Thanks for any help!