The event handlers are defined in the code-behind file that backs the XAML definition of your User Interface (UI), namely mypage.xaml.cs.
The Silverlight Event Mode
In Silverlight, there are two event cases:
Input Events: The browser that hosts the Silverlight plug-in handles initial input stimulus for the input events. This is because Silverlight works within the plug-in architecture of the hosting browser. From the browser, the event is sent to the Silverlight plug-in.
Then, it is raised as an event in the Silverlight Object Model.
Non-input Events: They report a state change to a particular object, for example, the state change events that report asynchronous download state or progress of actions initiated by Web Client. Some non-input events provide lifetime information of objects at a framework level.
For example the FrameworkElement.Loaded event
Some events, such as OnError, can only be handled by the Silverlight plug-in instance and exist within the HTML Document Object Model (DOM). These events need to be continually exposed and possibly handled by any script working with the plug-in instance in the DOM. Therefore; these events are not passed to the managed programming model.
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