How to select the individual image and then click the button

Question

Hi,
How to select the individual image and then click the button,need to send the selected image value?

   Each rectangle inside i added image control.when click the submit button,send the image value ,which image i select.How to select the image.Here image selection is not working.please help me.(wpf using mvvm)


SampleView.xaml:

<UserControl x:Class="GameDealModule.View.SampleView"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
             mc:Ignorable="d"
           d:DesignHeight="600" d:DesignWidth="1241" >

    <Grid Background="Gray" HorizontalAlignment="Center" VerticalAlignment="Center">
        <Canvas HorizontalAlignment="Left" Height="600" Margin="29,10,0,0" VerticalAlignment="Top" Width="1241">

            <Rectangle Height="209" Width="150" Canvas.Left="41" Stroke="Black" Canvas.Top="21"></Rectangle>          
              
            <Image Height="209" Width="150" Source="../Images/nature.png" Canvas.Left="41" Canvas.Top="21"></Image>           
          


            <Rectangle Height="209" Width="150" Canvas.Left="206" Stroke="Black" Canvas.Top="21" ></Rectangle>
          
            <Image Height="209" Width="150" Source="../Images/flower.png" Canvas.Left="206" Canvas.Top="21"></Image>


         <Button Content="Submit" Canvas.Left="372" Canvas.Top="533" Width="103" Height="37" Command="{Binding SubmitCommand}"/>
            <Button Content="Close" Canvas.Left="489" Canvas.Top="533" Width="103" Height="37" Command="{Binding CloseCommand}"/>

        </Canvas>
    </Grid>
</UserControl>

SampleView.xaml.cs:
 public partial class SampleView: UserControl
    {
        public SampleView()
        {
            InitializeComponent();
            this.DataContext = new SampleViewModel();
        }
    }

SampleViewModel.cs:
 public class SampleViewModel: INotifyPropertyChanged
    {
        public SampleViewModel()
        {
           
            this.SubmitCommand = new DelegateCommand<object>(this.OnSubmit, this.CanSubmit);

        }
        private bool CanSubmit(object arg)
        {
            return true;
        }


        private void OnSubmit(object arg)
        {
               string selectedimage="";

    }
      public ICommand SubmitCommand { get; private set; }
      

        #region INotifyPropertyChanged Members

        public event PropertyChangedEventHandler PropertyChanged;

        private void NotifyPropertyChanged(string propertyName)
        {
            if (this.PropertyChanged != null)
            {
                this.PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
            }
        }

        #endregion
    }