How get Selected Item in ComboBox

[Nelson]

Hi,

Someone can explain how I can get the Selected Item in ComboBox?

I want bind the selected Item to one variable in my ViewModel.

I did this code:

<telerik:RadComboBox Grid.Column="1" Grid.Row="1" Width="100" Height="20" HorizontalAlignment="Left"
                                                           ItemsSource="{Binding Path=DataContext.OCTiposNotificacao, ElementName=LayoutRoot2}"
                                                           DisplayMemberPath="DesignacaoProp" telerik:StyleManager.Theme="Expression_Dark"
                                                           SelectedItem="{Binding Path=DataContext.TipoNotificacaoSeleccionado, Mode=TwoWay}" />

In my ItemsSource I did this:
ItemsSource="{Binding Path=DataContext.OCTiposNotificacao, ElementName=LayoutRoot2}"
because  the "OCTiposNotificacao" is a second collection, that means that I have two collections in my ViewModel, so I declare like Path=DataContext.OCTiposNotificacao.

And I want bind the Selected Item to TipoNotificacaoSeleccionado.

But all I get is a null value...

Any help?

Thanks

[Nelson]

I already fix the problem.