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source. For example, imagine you fill a ComboBox control with Product objects and set the DisplayMemberPath property to ModelName so the combo box shows the ModelName property of each item. Even though the combo box retrieves its information from a group of Product objects, your markup creates an ordinary text list. As a result, the selection box will behave the way you expect it to behave. It will show the ModelName of the current product, and if IsEditable is true and IsReadOnly is false, it will allow you to edit that value.

The user won t be able to interact with the content that appears in the selection box. For example, if the content of the currently selected item includes a text box, you won t be able to type in it. If the currently selected item includes a button, you won t be able to click it. Instead, clicking the selection box will simply open the drop-down list. (Of course, there are countless good usability reasons not to put user-interactive controls in a drop-down list in the first place.) If the IsEditable property is true, the behavior of the ComboBox control changes. Instead of showing a copy of the selected item, the selection box displays a textual representation of it. To create this textual representation, WPF simply calls ToString() on the item. Figure 20-19 shows an example with the same combo box that s shown in Figure 20-19. In this case, the display text DataBinding.Product is simply the fully qualified class name of the currently selected Product object, which is the default ToString() implementation unless you override it in your data class.

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The PamelaWare add-in for WordPress provides information card support to the popular blogging engine WordPress. Pamela Dingle is the sponsor of the code, and it is built upon the PHP sample developed by Kim Cameron reviewed earlier in the chapter. The home page for the project is http://pamelaproject.com/pwwp/.

The easiest option to correct this problem is to set the attached TextSearch.TextPath property to indicate the property that should be used for the content of the selection box. Here s an example: <ComboBox IsEditable="True" IsReadOnly="True" TextSearch.TextPath="ModelName" ...> Although IsEditable must be true, it s up to you whether you set IsReadOnly to false (to allow editing of that property) or true (to prevent the user from typing in arbitrary text). Figure 20-20 shows the result.

Tip What if you want to show richer content than a simple piece of text but you still want the content in the selection

box to be different from the content in the drop-down list The ComboBox includes a SelectionBoxItemTemplate property that defines the template that s used for the selection box. Unfortunately, the SelectionBoxItemTemplate is read-only. It s automatically set to match the current item, and you can t supply a different template. However, you could create an entirely new ComboBox control template that doesn t use the SelectionBoxItemTemplate at all. Instead, this control template could hard-code the selection box template or could retrieve it from the Resources collection in the window.

It is likely that your Main window will be split into a number of different sections, each with its own ViewModel. This avoids the maintenance effort of one monolithic ViewModel with a number of disparate responsibilities that can all too easily become unwieldy. Instead, the main ViewModel will hold other ViewModels that service distinct sections of the view such as a dedicated ToolBarViewModel, MenuViewModel, or TabbedWindowsViewModel. You may have noticed that Listing 4 17 did not include a StartupUri in the application XAML. Ordinarily, the StartupUri contains the name of the XAML view you wish to show on application startup. However, we often require more control over the construction of our views in MVVM, because they are sometimes useless without an accompanying ViewModel. The initial construction of the MainViewModel is, then, delegated to the ApplicationViewModel, as shown in Listing 4 18.

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