I've been tinkering with a tiny Silverlight app, and I kept running into the situation where the code would work in IE and Safari, but not Firefox. Turns out I was using some older sample code as a guide that had a problem.
In particular, when creating the silverlight object, I was using code like this:


Sys.Silverlight.createObjectEx({source:'page.xaml' ,
parentElement: agControlHost,
id:'silverlightObj',
properties: { width:'300',
height:'200',
background:'#ffffffff',
isWindowless: 'false',
framerate:'24',
version:'0.8' },
events: { onError:null,
onLoad:null },
context:null });



Unfortunately, I kept getting an error that parentElement didn't exist. It took me awhile to realize that I needed to use getElementById() instead to fix the problem:


Sys.Silverlight.createObjectEx({source:'page.xaml' ,
parentElement: document.getElementById('agControlHost'),
id:'silverlightObj',
properties: { width:'300',
height:'200',
background:'#ffffffff',
isWindowless: 'false',
framerate:'24',
version:'0.8' },
events: { onError:null,
onLoad:null },
context:null });



Now my Silverlight experiment works just fine in IE, Firefox, and Safari.


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