Question

I found some items regarding this questions on SO, but they do not satisfy me. They talk about INotifyProperyChanged, but that does not help in my case.

I have a Combobox.
For the ItemsSource, I use a MultiBinding and a Converter to create an ICollectionView. The ICollectionView gets bound to the ItemsSource.

On the GotFocus-event, this binding needs to be refreshed, so the converter gets fired again.

How can I do this?

Answer 1

Ok, a collegue helped me out.

This is the solution:

private void theComboBox_OnGotFocus(object sender, RoutedEventArgs e)
{
    ComboBox theComboBox = sender as ComboBox;

    if (theComboBox != null)
    {
        MultiBindingExpression binding = BindingOperations.GetMultiBindingExpression(theComboBox, ComboBox.ItemsSourceProperty);
        if (binding != null)
        {
            binding.UpdateTarget();
        }
    }
}