WPF: Get name of clicked rectangle in ViewModel

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XAML

WPF

MVVM

rectangle

ViewModel

Hi everybody,
I just want to get a clicked element name in the ViewModel code.
Basically, I generate several rectangles programmatically

<ItemsControl ItemsSource="{Binding CaskList}" HorizontalAlignment="Left" VerticalAlignment="Top">
                <ItemsControl.ItemsPanel>
                    <ItemsPanelTemplate>
                        <Canvas Width="1680" Height="800" MouseDown="Canvas_MouseDown">
                        </Canvas>
                    </ItemsPanelTemplate>
                </ItemsControl.ItemsPanel>
                <ItemsControl.ItemContainerStyle>
                    <Style TargetType="ContentPresenter">
                        <Setter Property="Canvas.Left" Value="{Binding Left}"/>
                        <Setter Property="Canvas.Top" Value="{Binding Top}"/>
                    </Style>
                </ItemsControl.ItemContainerStyle>
                <ItemsControl.ItemTemplate>
                    <DataTemplate>
                        <Grid>
<Rectangle Stroke="Black" Width="64" Height="64" Fill="{Binding Color}" ></Rectangle> 
                            <Label Content="{Binding ID}" FontSize="14" HorizontalAlignment="Center" VerticalAlignment="Center"/>-->
                        </Grid>
                    </DataTemplate>
                </ItemsControl.ItemTemplate>
            </ItemsControl>

I just want to get the name of the clicked rectangle in my ViewModel.
I tried in many ways: using "MouseLeftButtonUp" in <Canvas> works fine but I only get the name in the View code, then I am not able to pass it to the ViewModel (and AFAIK this is completly against MVVM rules). so I tried to use RelayCommand and it works fine in VM, but I don't have the event MouseButtonEventArgs anymore, so I don't know how to retrive the name of the clicked rectangle.

P.S. I was so frustrated that I tried to use buttons instead of Rectangles+Textbox but I don't know why the binding path doesn't work inside the canvas, and my ICommand was never called.

Please help me!