Returns whether or not this page has dynamically received its content.
true, if this page has dynamically received its content; otherwise, false.
A page is a deferred load page if it receives its content:
- on the NavigationFrame.QueryControl event;
- on the NavigationFrame.AddPage method call if the page has an associated control (see the NavigationPageBase.ControlName and NavigationPageBase.ControlTypeName properties).