The good folks over at Silverlight Show have just put up my article about writing a custom control. One of my earliest posts was on using a UserControl to create a WatermarkedTextBox. I’ve been meaning to follow up on it for a while on how to achieve the same thing (but better) using a Custom Control. In the example below it’s wired up as a filter for the list box. You can check the “Styled” box to apply a different style to the whole app, including the WatermarkedTextBox.
Go over to Silverlight Show to grab the source and read the full article.