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This behavior is controlled by a property on the binding called Update Source Trigger.It defaults to the value "Default", which basically means that the source is updated based on the property that you bind to.The command that sets the property 'Is Eco Generated' is a command on the View Model.Hi Odd Veibust, Do you set the value of the 'Is Eco Generated' property from the UI or from code behind?The only constraint when using this class is that instances of the collection must be created on the UI thread, so that events are raised on that thread.In the previous example, the only thing to change to make the collection modifiable across threads is the instantiation of the collection in the View Model : to raise the event when the collection is modified from the main thread can cause unpredictable behavior.This lightweight toolkit is the most popular Model-View-View Model (MVVM) framework for platforms such as Windows Presentation Foundation (WPF), Silverlight, Windows Phone, Windows Store, Xamarin. Forms, the newest addition to the Xamarin frameworks, which allows you to build the UI in XAML once, and to run it on Android, i OS and Windows Phone.

Default is, obviously, the default value of the Update Source Trigger.

The filter is working ok when the Grid View is loaded, item's are showing or not based on the property 'Is Eco Generated'.

The problem is that the Grid View is not updated and removing item's if I set the property 'Is Eco Generated' to true on one (or several) of the items.

Similarly, in the case of “two-way” data binding, modifying a value in the UI will automatically update the View Model, as well.

Data binding has been available for client applications for some time, even before WPF and all the other XAML-based technologies were introduced. NET Web Forms, data controls such as the listbox can be data-bound to a collection of items that need to be represented on the screen.