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property in WPF is extremely handy, because it is automatically inherited by all children of the element where you assign it; therefore you don’t need to set it again on each element you want to bind.However, in some cases the is not accessible: it happens for elements that are not part of the visual or logical tree.In our case, the tree we want to represent is that Excel has a collection of Workbook objects, which each has a collection of Worksheet objects. Let’s add a folder “Tree View” inside our existing Task Pane folder, and create 3 public classes: Excel View Model, Workbook View Model and Worksheet View Model.The Excel View Model will expose an Observable Collection of its Workbook View Model(s), which will provide the View with information on how to display each workbook.Dynamic Data Display integrates well with Bing Maps control to show data on a geographic map in latitude/longitude coordinates.

At this point, it seems that the only viable approach would be to change the column visibility in code-behind, which we usually prefer to avoid when using the MVVM pattern…Well, microsoft provides us Composite Collection and Collection Container classes for this purpose.However it is a real pain to use data binding with this classes in XAML.In other Items Controls, like Tree Views, it can be enabled using the Virtualizing Stack Panel. You can read more about UI Virtualization and Container Recycling in this article: I opened the View Discovery Composition Quickstart from the latest Prism-v2 Drop and modified the Employee Service class’ (located in the Employees Module) implementation for the following one and ran the application: In fact, the list of employees took ages to load.I got a little deeper and found in the article mentioned above that even if the List View performs UI Virtualization by default there are some possible reasons why UI Virtualization disabled.

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