Binding to SearchText has no effect

[cocowalla]

Binding a view model property to the SearchText property of a RadAutoCompleteBox seems to have no effect (when typing in the RadAutoCompleteBox, the view model property remains null).

Is this by design? Is there a workaround?

[cocowalla]

OK, it seems to work if I explicitly set Mode to TwoWay and UpdateSourceTrigger to PropertyChanged on the binding like:

{Binding SearchText, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged