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Dependency objects are organized in a tree structure, either directly via XAML markup or indirectly via the Visual Studio designer. Whenever a child is assigned to a parent, attached properties that are marked as inheritable are automatically assigned from the parent to the child. Note that this is not inheritance as it is defined in object-oriented programming: between base classes and their subclasses. This is containment inheritance, whereby an object merely has to be a contained child in order to inherit the parents properties and their values. This works using attached properties that are implicitly added to contained objects dynamically. An example of an inheriting property is shown in Listings 2 4 and 2 5. Listing 2 4. The XAML Markup of an Inherited Property <MyDependencyObject MyProperty="Hello!"> <Button /> </MyDependencyObject> Listing 2 5. The Code Behind that Makes MyDependencyProperty Inheritable public class MyDependencyObject : DependencyObject { public static MyDependencyObject() { MyDependencyProperty = DependencyProperty.RegisterAttached("MyProperty", typeof(string), typeof(MyDependencyObject), new FrameworkPropertyMetadata (string.Empty, FrameworkPropertyMetadataOptions.Inherits)); } public static readonly DependencyProperty MyDependencyProperty; public string MyProperty { get { (string)GetValue(MyDependencyProperty); } set { SetValue(MyDependencyProperty, value); } } }

As you learned in 20, you can vary templates so that different data items get different templates. To do this, you need to create a template selector that chooses the appropriate template based on the properties of the data object at that position. To use this feature, create your selector, and use it to set the GridViewColumn.CellTemplateSelector property. For a full template selector example, see 20.

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So far, you ve seen how to customize the appearance of the values in every cell. However, you haven t done anything to fine-tune the column headers. If the standard gray boxes don t excite you, you ll be happy to find out that you can change the content and appearance of the column headers just as easily as the column values. In fact, you can use several approaches. If you want to keep the gray column header boxes but you want to fill them with your own content, you can simply set the GridViewColumn.Header property. The previous examples have the Header property using ordinary text, but you can supply an element instead. Use a StackPanel that wraps a TextBlock and Image to create a fancy header that combines text and image content. If you want to fill the column headers with your own content, but you don t want to specify this content separately for each column, you can use the GridViewColumn.HeaderTemplate property to define a data template. This data template binds to whatever object you ve specified in the GridViewColumn.Header property and presents it accordingly. If you want to reformat a specific column header, you can use the GridViewColumn.HeaderContainerStyle property to supply a style. If you want to reformat all the column headers in the same way, use the GridView.ColumnHeaderContainerStyle property instead. If you want to completely change the appearance of the header (for example, replacing the gray box with a rounded blue border), you can supply a completely new control template for the header. Use GridViewColumn.HeaderTemplate to change a specific column, or use GridView.ColumnHeaderTemplate to change them all in the same way. You can even use a template selector to choose the correct template for a given header by setting the GridViewColumn.HeaderTemplateSelector or GridView.ColumnHeaderTemplateSelector property.

If the GridView doesn t meet your needs, you can create your own view to extend the ListView s capabilities. Unfortunately, it s far from straightforward. To understand the problem, you need to know a little more about the way a view works. Views do their work by overriding two protected properties: DefaultStyleKey and ItemContainerDefaultKeyStyle. Each property returns a specialized object called a ResourceKey, which points to a style that you ve defined in XAML. The DefaultStyleKey property points to the style that should be applied to configure the overall ListView. The ItemContainer.DefaultKeyStyle property points to the style that should be used to configure each ListViewItem in the ListView. Although these styles are free to tweak any property, they usually do their work by replacing the ControlTemplate that s used for the ListView and the DataTemplate that s used for each ListViewItem. Here s where the problems occur. The DataTemplate you use to display items is defined in XAML markup. Imagine you want to create a ListView that shows a tiled image for each item. This is easy enough using a DataTemplate you simply need to bind the Source property of an Image to the correct property of your data object. But how do you know which data object the user will supply If you hardcode property names as part of your view, you ll limit its usefulness, making it impossible to reuse your

Note You won t run into this headache when setting the properties for WPF controls. That s because a value

At this point, you ve already had hands-on experience with the CardSpace identity selector and the support for it built into Microsoft s web browser, Internet Explorer 7. In the following sections, you ll examine solutions where the CardSpace identity selector is leveraged outside Internet Explorer, as well as in other browsers.

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