PreviewClosed and TextBox TwoWay binding issues

[Alex]

I'm currently using hte PreviewClosed to stop the window from closing by doing something like:
if (.... entities have changes) e.Cancel = true

However, I've recently noticed that TextBox TwoWay bindings do not get updated until AFTER the PreviewClosed is fired. Are there any easy ways to work around this?

[Miroslav Nedyalkov]

Hi Alex,

You are observing this issue because the focusing mechanism of Silverlight, which TwoWay Bindinding depends on, is asynchronous and the binding is not updated when the event occurs. You could add the following code when the PrviewClose event is fired:

textBox.GetBindingExpression(TextBox.TextProperty).UpdateSource();

It will force the binding to update.

Hope this helps.

Regards,
Miroslav Nedyalkov
the Telerik team