Databinding ComboBox to GraphicsCollection

[KeithGemeinhart]

Greetings,

I'd like to bind a GraphicsCollection (which is a property in a view model) to a combo box in a XAML window. The problem is I can't figure out how to display attribute values in the combo box. I can get it to display the Geometry property like this:

<ComboBox DataContext="{StaticResource MyViewModel}"                 DisplayMemberPath="Geometry"                 ItemsSource="{Binding CollectionOfGraphics}"  />

But I want to be able to do something like this that will display the OBJECTID or some other attribute:

<ComboBox DataContext="{StaticResource MyViewModel}"                 DisplayMemberPath="Attributes[&quot;OBJECTID&quot;]"                 ItemsSource="{Binding CollectionOfGraphics}"  />

I also tried this approach - unsuccessfully:

<ComboBox DataContext="{StaticResource MyViewModel}"                 DisplayMemberPath="Attributes[0]"                 ItemsSource="{Binding CollectionOfGraphics}"  />

[AnttiKajanus1 · Accepted solution]

Answered to http://gis.stackexchange.com/questions/68219/databinding-combobox-to-graphicscollection-esri-wpf-run....

[KeithGemeinhart]

Here is the solution based on Antti Kajanus's answer on stackexchange:

<ComboBox DataContext="{StaticResource MyViewModel}"
                ItemsSource="{Binding CollectionOfGraphics}" >
     <ComboBox.ItemTemplate>
          <DataTemplate>
              <TextBlock Text="{Binding Attributes[OBJECTID]}"/>
          </DataTemplate>
     </ComboBox.ItemTemplate>
</ComboBox>

Note that the attributite name (OBJECTID) did not have to be quoted.