Question

I need to access list box selected item from the user control. How can I manage that?
For example If I have ListBox x:Name="NewPicturesListBox" in MainPage.xaml

!--Panorama item New one-->
            <controls:PanoramaItem Header="New one"  Name="Pan1" >
                <Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">
                    <ListBox Margin="0,0,-12,0" x:Name="NewPicturesListBox"

And I need to access them from DetailControl.xaml.cs
The code below can give me the result within the MainPage.xaml, what about other pages, if any possibility exist?

                if (NewPicturesListBox.ItemContainerGenerator != null)
                {
                    var contextMenuListItem = (ListBoxItem)(NewPicturesListBox.ItemContainerGenerator.ContainerFromItem(((MenuItem)sender).DataContext));
                    if (contextMenuListItem != null)
                    {
                        var selectedPicture = (contextMenuListItem).Content as Picture;

Answer 1

You can have in you ViewModel and Property, lets call it selectedPicture that will hold the selectedValue, and bind to it from your XAML :

   <ComboBox Name="NewPicturesListBox" MinWidth="100" VerticalAlignment="Center" 
                                  ItemsSource="{Binding ListOfPictures}" 
                                  DisplayMemberPath="Name"
                                  SelectedValue ="{Binding Path=SelectedPicture}"  Width="141" />