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Instead, the source was updated only after focus was lost on the Text Box.This behavior is controlled by a property on the binding called Update Source Trigger.Shouldn't have to worry about niggly little details like this, we just want it to work as one would expect. although i'm using angular, i constantly hit this problem all the time where what the dropdownlist shows as being selected is out of sync w/ ngmodel. lol With all these changes, now the widget can match the model state and we will not be forced to update the model automatically on load, which is "dead wrong".In the previous article we saw how changes in a Text Box was not immediately sent back to the source.I could not think of an easy fix but all of the sudden I had a lucky hunch.I switched the Item Source and Selected Item in the combobox XAML like this: And tada everything worked as it should ...The first two has already been described, while the last one simply means that the update has to be pushed manually through to occur, using a call to Update Source on the Binding.

The second Text Box uses the Lost Focus value, which is actually the default for a Text binding.Hello @rally25rs, The described behavior is actually expected, because the MVVM value binding updates the model on widget change, which does not happen on initial loading/binding.In general, the Drop Down List widget should always have a selected item - if there is no value, then the first one will be selected.It means that the source value will be updated each time the destination control loses focus.The third and last Text Box uses the Property Changed value, which means that the source value will be updated each time the bound property changes, which it does in this case as soon as the text changes.

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