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User controls are a great way couple logic and XAML in an encapsulated way. A user control contrasts with a custom control in that a custom control contains no XAML. And though it says you may safely continue, it doesn’t continue safely at all. It means the binding target isn’t a dependency property!You can reuse a user control over and over and the logic is isolated from the general flow of your program. Custom control can be (and is sometimes are required to be) templated (for example, a Data Template). This is confusing to XAML developers because they are accustomed to binding to CLR properties that implement INotify Property Changed in their view models. A data binding source source CAN be a CLR-type property.That's the problem: I got the problem, that common properties (DP's) defined in the Xaml code and set in the View Model implementation (see code below) are not updated, even if I can't find any wrong code while debugging.This applies only to the properties I got, furthermore i got some Observable Collection But this does not work too (I just added this line for example into the code-behind file of the Xaml file - and left anything else at it is) My code looks this way: Constructor of the Forms Element (it's actually private because I implemented it as Singleton): Furthermore I created an underlying View Model and set this as Data Context Property of the WPFUI like this (it's also a Singleton implementation because I wanted to access in a further implementation the same instance from several places, but this does not come into the game at this time): regarding 2) you're right, see the implementation above.public bool Is Visibile public static readonly Dependency Property Is Visibile Property = Dependency Property.Register("Is Visibile", typeof(bool), typeof(User Control), new Property Metadata(default(bool), Visible Property Changed Callback)); private static void Visible Property Changed Callback(Dependency Object dependency Object, Dependency Property Changed Event Args dependency Property Changed Event Args) property has changed.

That's why i can't guess where there might be an error ...

Conversely, user controls cannot be templated as the XAML is embedded. Net developer then you will likely start with simple CLR properties. Like this: Setting such a property is a snap, and it works just fine. A data binding target MUST be a dependency property.

The simplest user control might look like this: The simplest use of a user control would be like this: In the code above, I simply declare the user control and the rest is done for me. You can reference it in the code behind or you can reference it in the XAML. Once we know the property must be a dependency property (which simply means the property must be backed by a dependency property object) we can start to build it out: In the code above, we create our Text property as a dependency property and we introduce a reusable method called Set Value Dp() which uses the Call Member Name introduced in . Call Member Name let’s you reference your property name without creating a literal string in your code-behind.

Now you set the same property another time, that's pointless.

And even worse, setting the property effectively removes the binding.

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