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(Provided it's not a postback) On Web User Control1, there is a textbox and a label.The page load of the usercontrol sets the values of both the textbox and the label to the value of str Test. There is a plain old html button on Web User Control1 that executes some client script to open a popup window. Change has some code in the page load that changes the value of str Test from "Some Value" to "New Value".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.I am sending you the sample project I used for reproducing the case.Please take a look at it and let me know in case of any misunderstandings. The code in the handler explicitly updates the employee-details user control if an employee is selected, or if the current page in the employee list no longer shows the selected employee.

is this being recognized in the code-behind as NOT a Post Back(), since its really not, and the value is being reset?Since data context is a dependency property and dependency properties inherit down the visual tree, we can set the data context of a container and intercept the data context’s inheritance.Like this: In the code above we don’t set the data context of the user control, we set the data context of the first child in the user control. This one little workaround can save you dozens of hours pulling your hair.It’s up to use to use the mode that is appropriate for the controls you are embedding in your user control.The dependency property does the rest – and that’s that!

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