C# MVVM Treeview SelectedItem Binding with ICommand. Thoughts?

I've been doing a lot of research and I don't understand exaclty how to properly bind an ICommand to my TreeView item.

I have a VM that holds a Data Object.

This data object holds an ObservableCollection object of TreeNode item objects.

This TreeNode Item has properties such as Tag, IsSelected, Header and even a ContextMenu.

However I can't figure out how to bind an ICommand to a single TreeView item.

Here is my XAML of my TreeView

 <TreeView Grid.Column="0" Grid.Row="0" Grid.ColumnSpan="1" Grid.RowSpan="5" x:Name="TestPlanTreeView" ItemsSource="{Binding Data.TestPlanCollection}" dd:DragDrop.IsDragSource="True" dd:DragDrop.IsDropTarget="True"> <TreeView.ItemContainerStyle> <Style TargetType="TreeViewItem"> <Setter Property="Focusable" Value="{Binding Focusable, Mode=TwoWay}"/> <Setter Property="IsSelected" Value="{Binding IsSelected, Mode=TwoWay}"/> <Setter Property="IsExpanded" Value="{Binding IsExpanded, Mode=TwoWay}"/> <Style.Triggers> <Trigger Property="IsSelected" Value="True"> <Setter Property="FontWeight" Value="Bold"/> <Setter Property="FontStyle" Value="Italic"/> </Trigger> </Style.Triggers> </Style> </TreeView.ItemContainerStyle> <TreeView.ItemTemplate> <HierarchicalDataTemplate ItemsSource="{Binding Children}"> <TextBlock Text="{Binding Header}" Margin="2"> <TextBlock.ContextMenu> <ContextMenu ItemsSource="{Binding MenuCollection}"> <ContextMenu.ItemContainerStyle> <Style TargetType="MenuItem"> <Setter Property="Header" Value="{Binding Header}"/> <Setter Property="Command" Value="{Binding Command}"/> <Setter Property="CommandParameter" Value="{Binding CommandParameter}"/> </Style> </ContextMenu.ItemContainerStyle> </ContextMenu> </TextBlock.ContextMenu> </TextBlock> </HierarchicalDataTemplate> </TreeView.ItemTemplate> </TreeView>