I need to get attribute of listbox selecteditem wpf

Question

I have that listbox: my bind is ProdutoGrupoViewModel, and list named as ListBoxGrupos

<ListBox HorizontalAlignment="x:Name="ListBoxGrupos"
         ItemsSource="{Binding ProdutoGrupoViewModel}" 
         SelectionChanged="ListBoxGrupos_SelectionChanged">
    <ListBox.ItemTemplate>
        <DataTemplate x:Name="ListViewGrupos">
            <StackPanel>
                <TextBlock Text="{Binding Descricao}"/>
            </StackPanel>
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

and when i get on my xaml.cs the property ListBoxGrupos.selectedItem, that returns for me an object

that object have some attributes

Obj.Descricao = "Pizzas"
Obj.GrupoCor = "FF8040"
Obj.GrupoID = 3 
Obj.Image = "..."
Obj.Position = "0" ```

(i tried to upload the image of that obj, but need reputation, so i tried to explain)

i want to know how can i get the attribute GrupoID.

Answer 1

You need to cast the object to specified class

    Grupo gru = (Grupo)ListBoxGrupos.SelectedItem;

    gru.GrupoID = 3;