Thank you for your interest in RadWindow.
In Silverlight, the TwoWay binding to the Text property of TextBox works differently. A change to the target updates the source when the TextBox loses its focus. Also there is a difference in the Silverlight and WPF focusing systems. The RadWindow moves the focus in the same way, but Silverlight moves the focus asynchronously and WPF moves it synchronously.
However, you can easily achieve what you want by modifying your code a little:
Adding the code below in OnViewPreviewClosed will update the target immediately:
BindingExpression bindingExpression =
I have attached an example. Hope this helps.
All the best,
the Telerik team
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