I want my Silverlight app to fill the entire browser window. I\'ve set the plugin object width and height to 100%, and set my LayoutRoot container\'s height and width to Aut
Hmm
I'm thinking your Grid is set-up to be as small as possible (no "star" column or row). Can you try with one more column and row with a "star" size ?
as other have pointed out, you also need to remove the "auto" sizes, since they auto-size to content.
also try to set a background color on the page, so you see where it actually extends.