Two-way binding to SelectedItem? -or- Why isn't there a ValueMemberPath?

[Rob]

I have the ItemsSource of a RadListPicker bound to a Key/Value list. I've bound the key/value list to the ItemsSource of the RadListPicker. I'm trying to two-way bind the SelectedItem to a property on the ViewModel.

On the WinForms RadComboBox, there are both DisplayMember and ValueMember, which makes data binding easy (set DisplayMember = "value", ValueMember = "key", and bind to SelectedValue). On RadListPicker, there is DisplayMemberPath but no ValueMemberPath. When I try to bind to SelectedItem, I get an ArgumentException "SelectedItem is not contained within the ItemsSource." exception, because it's trying to bind to the key/value pair object, not the key value of the pair.

I'm trying to think if there's a way to write a two-way converter to do what I want, but I think I'd need access to the ItemsSource of the list picker in order to iterate over its items and pick the appropriate one.

[Todor]

Hi Rob,

Thank you for contacting us.

I am not sure that I understand exactly what you are trying to achieve. If I am right, you want a two-way binding to the SelectedItem in RadListPicker and when you change the bound item, you want the selection in the ListPicker to reflect the change. I have attached a quick sample that demonstrates a way to do this with a converter. Please, take a look at it and confirm that this is what you want to do. If not, please explain in more details, or prepare a sample that recreates your scenario, so I can assist you further.

Please note that you will need to open a new support ticket in order to attach your sample application.

I am looking forward to your response.

All the best,
Todor
the Telerik team

[Rob]

Submitted as 521841. Hopefully it makes more sense with the sample code.

[Todor]

Hello Rob,

Please refer to the support ticket that you sent us regarding the same topic.

Thank you for your time.

Kind regards,
Todor
the Telerik team