Observablecollection binding not updating Pussyhookups

Additionally, the following List View events are raised only when using an Items Wrap Grid or an Items Stack Panel: Choosing Group Header Container, Choosing Item Container, and Container Content Changing.The concept of a viewport is critical to UI virtualization because the framework must create the elements that are likely to be shown.The benefit of even a small reduction in element count is multiplied by the number of items displayed.For examples of element reduction, see Optimize your XAML markup.When an items control is first shown, all the elements needed to render a viewport full of items are created.Also, as items approach the viewport, the framework updates the UI elements in cached item templates with the bound data objects.If you provide a custom items panel template (see Items Panel) then make sure you use a virtualizing panel such as Items Wrap Grid or Items Stack Panel.If you use Variable Sized Wrap Grid, Wrap Grid, or Stack Panel, then you will not get virtualization.

When a virtualized Items Control is placed in a panel like that, it takes enough room to display all of its items, which defeats virtualization.Minimizing the complexity of the markup inside templates pays off in memory and in time spent on the UI thread, improving responsiveness especially while panning/scrolling.The templates in question are the item template (see Item Template) and the control template of a List View Item or a Grid View Item (the item control template, or Item Container Style).Restore virtualization by setting a width and height on the Items Control.Keep the number of UI elements used to render your items to a reasonable minimum.

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For data virtualization techniques, see List View and Grid View data virtualization. A photo viewer has collections of photos, a reader has collections of articles/books/stories, and a shopping app has collections of products.

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