<Grid x:Name="LayoutRoot">
        <Canvas>
            <Rectangle x:Name="Graph" 
               Canvas.Left="{Binding XProperty, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
               Width="200" Height="100" Fill="Black">
                <i:Interaction.Behaviors>
                    <il:MouseDragElementBehavior/>
                </i:Interaction.Behaviors>
                <i:Interaction.Triggers>
                    <i:EventTrigger EventName="MouseRightButtonDown">
                        <cmd:EventToCommand Command="{Binding EditShapeCommand}"/>
                    </i:EventTrigger>
                </i:Interaction.Triggers>
            </Rectangle>
        </Canvas>
    </Grid>

    public class ShellViewModel : ViewModelBase
    {

        public int XProperty { get; set; }

        private RelayCommand _editShapeCommand;

        public RelayCommand EditShapeCommand
        {
            get { return _editShapeCommand ?? (_editShapeCommand = new RelayCommand(EditShape)); }
        }

        private void EditShape()
        {
            XProperty = 0;
            RaisePropertyChanged("XProperty");
        }
        
        public ShellViewModel()
        {
            XProperty = 100;
        }
    }

i:Interaction.Behaviors>
      <il:MouseDragElementBehavior X="{Binding XProperty, Mode=TwoWay}"/>
</i:Interaction.Behaviors

<Rectangle x:Name="Graph"
                       RenderTransform="{Binding MyTransform, Mode=TwoWay}"
                       Width="200" Height="100" Fill="Black" >

public Transform MyTransform { get; set; }