How To Call Javascript Function On A Silverlight 3 Object

I have the following Silverlight control defined:

[Code]....

I have exposed the following method in my Silverlight control (Page.xaml.cs) to be accessible to Javascript:

[ScriptableMember]
public bool HasPendingUpdates()
{
return btnSave.IsEnabled;
}

I then have a Javascript test function in my aspx page that is trying to do something with it:

var imageViewer = $("#objImageViewer")[0];
if (imageViewer.Content.Page.HasPendingUpdates())
{
alert("Pending Changes Exist!");
}
else
{
alert("NO Pending Changes Exist!");
}

Problem is that it fails after the Content object. I have tested the following:

var imageViewer = $("#objImageViewer")[0];
imageViewer // Valid
imageViewer.Content // Valid
imageViewer.Content.Page // Invalid
imageViewer.Content.HasPendingUpdates() // Invalid

So I am not sure what I am doing wrong. How do I get to the function within Content?

I am using IE8, Silverlight 3, ASP.NET. The silverlight control is created with the object tag as I don't think the control is an option in Silverlight 3+.