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In his previous post, Marlon Grech explained how Silverlight 4 lacks the UpdateSourceTrigger for PropertyChanged and how to overcome this issue for the TextBox. In this post he shows how to do this for any Dependency Property of any Framework element.

Source: C# Disciples

Please note that this post is quite an experimental one. Probably the use case you are looking for is for the textbox scenario, if that is the case I would suggest that you use the more explicit approach i.e the one I show in my previous post. The take away from this post should be more the idea of how things work rather than the actual code I am using here, this code was never tested in production thus it might contain memory leaks and other issues.

Marlon Grech explains how you can specify that a certain binding should update the source on PropertyChanged in Silverlight 4.

Source: C# Disciples

In Silverlight 4 there is no way out of the box to specify that a certain binding should update the source on PropertyChanged, the options for the UpdateSourceTrigger are LostFocus and Explicit.

These options are more or less what you really need for most scenarios, yet sometimes you want to have the ability to update the binding while a property is changing. A use case would be, you have a textbox and you want to apply some validations while the user is typing, maybe you enable a button if the text entered is correct or disable it if it is not correct.