Basic TreeView with DataTemplate that contains a ContextMenu capable to bind to TreeView DataContext.

gistfile1.xml

<TreeView x:Name="treeExample"
                  ItemsSource="{Binding Items}">
            <TreeView.Resources>
                <DataTemplate DataType="{x:Type yourNamespace:BussinessObjectViewModel}">
                    <StackPanel Orientation="Horizontal">
                        <TextBlock
                            Name="txtId"
                            Text="{Binding Id}"
                            />
                        <TextBlock
                            Name="txtSeparator"
                            Text=" - "
                            />
                        <TextBlock
                            Name="txtName"
                            Text="{Binding Name}"
                            />
                        <StackPanel.ContextMenu>
                            <ContextMenu>
                                <MenuItem >
                                    <MenuItem.Header>
                                        <TextBlock Name="txtBindingName"
                                                   Text="{Binding DataContext.Name, RelativeSource={RelativeSource TemplatedParent}}"
                                                   />
                                    </MenuItem.Header>
                                </MenuItem>
                            </ContextMenu>
                        </StackPanel.ContextMenu>
                    </StackPanel>                    
                </DataTemplate>
            </TreeView.Resources>
        </TreeView>