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You could hard-code all your colors to avoid this problem, but then you ll face another challenge. The only indication that an item is selected will be the blue background around your curved border. To solve this problem, you need to use the familiar ItemContainerStyle property to apply different formatting to the selected item: <ListBox Name="lstProducts" HorizontalContentAlignment="Stretch"> <ListBox.ItemContainerStyle> <Style> <Setter Property="Control.Padding" Value="0"></Setter> <Style.Triggers> <Trigger Property="ListBoxItem.IsSelected" Value="True"> <Setter Property="ListBoxItem.Background" Value="DarkRed" /> </Trigger> </Style.Triggers> </Style> </ListBox.ItemContainerStyle> </ListBox> This trigger applies a dark red background to the selected item. Unfortunately, this code doesn t have the desired effect for a list that uses templates. That s because these templates include elements with a different background color that s displayed over the dark red background. Unless you make everything transparent (and allow the red color to wash through your entire template), you re left with a thin red edge around the margin area of your template. The solution is to explicitly bind the background in part of your template to the value of the ListBoxItem.Background property. This makes sense after all, you ve now gone to the work of choosing the right background color to highlight the selected item. You just need to make sure it appears in the right place.

The markup you need to implement this solution is a bit messy. That s because you can t make do with an ordinary binding expression, which can simply bind to a property in the current data object (in this case, the Product object). Instead, you need to grab the background from the item container (in this case, the ListBoxItem). This involves using the Binding.RelativeSource property to search up the element tree for the first matching ListBoxItem object. Once that element is found, you can grab its background color and use it accordingly. Here s the finished template, which uses the selected background in the curved border region. The Border element is placed inside a Grid with a white background, which ensures that the selected color does not appear in the margin area outside the curved border. The result is the much slicker selection style shown in Figure 20-15. <DataTemplate> <Grid Margin="0" Background="White"> <Border Margin="5" BorderThickness="1" BorderBrush="SteelBlue" CornerRadius="4" Background="{Binding Path=Background, RelativeSource={ RelativeSource Mode=FindAncestor, AncestorType={x:Type ListBoxItem} }}" > <Grid Margin="3"> <Grid.RowDefinitions> <RowDefinition></RowDefinition> <RowDefinition></RowDefinition> </Grid.RowDefinitions> <TextBlock FontWeight="Bold" Text="{Binding Path=ModelNumber}"></TextBlock> <TextBlock Grid.Row="1" Text="{Binding Path=ModelName}"></TextBlock> </Grid> </Border> </Grid> </DataTemplate>

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You should make one other change to ensure your template displays perfectly on computers with different system DPI settings (such as 120 dpi rather than the standard 96 dpi). You should set the ListBox.SnapsToDevicePixels property to true. This ensures that the edge of the list doesn t use antialiasing if it falls in between pixels. If you don t set SnapsToDevicePixels to true, it s possible that you ll get a trace of the familiar blue border creeping in between the edge of your template and the edge of the containing ListBox control. (For more information about fractional pixels and why they occur when the system DPI is set to a value other than 96 dpi, see the discussion about WPF s device-independent measuring system in 1.)

This approach using a binding expression to alter a template works well if you can pull the property value you need out of the item container. For example, it s a great technique if you want to get the background and foreground color of a selected item. However, it isn t as useful if you need to alter the template in a more profound way. For example, consider the list of product shown in Figure 20-16. When you select a product from this list, that item is expanded from a single-line text display to a box with a picture and full description. This example also combines several of the techniques you ve already seen, including showing image content in a template and using data binding to set the background color of the Border element when an item is selected.

Lightweight Identity (LID) is an approach whereby you use a URL for an identifier for an individual, persona, or entity. Table 4-2 lists some example LIDs.

The XAML file for the application (Listing 4 16) imports the ViewModel namespace and declares the ApplicationViewModel as a resource, with its own unique key The reason we declare the ApplicationViewModel in this way is so that all other views within the application can access this ViewModel and use the top-level services it offers Perhaps we wish to store the application name in the ApplicationViewModel; there are plenty of places we may want to reference such information and we can do so entirely with data binding as long as we declare the ApplicationViewModel in the application s XAML file Listing 4 16 The Appxaml file, Containing the ApplicationViewModel Declaration <Application x:Class="MvvmWpfAppApp" xmlns="http://schemasmicrosoftcom/winfx/2006/xaml/presentation" xmlns:x="http://schemasmicrosoftcom/winfx/2006/xaml" xmlns:viewModel="clrnamespace:MvvmWpfAppViewModel;assembly=MvvmWpfAppViewModel" Startup="Application_Startup"> <ApplicationResources> <viewModel:ApplicationViewModel x:Key="applicationViewModel" /> </ApplicationResources> </Application> Notice that the XAML has registered a listener for the application s Startup event.

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