record last mouse click

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C#

Visual-Studio

How would I record last mouse click ?
I have a program where I have images called red_balloon and green_balloon.
I give the user points depending if they click the balloons in the right order, red_balloon then green_balloon.
If the order is not correct they loose a point.
So I need a way to record last click, is there a simple way of doing this.

Here is my code so far..

**Code XAML**

<Image Height="53" HorizontalAlignment="Left" Margin="0,0,0,0" x:Name="red_balloon" Stretch="Fill" VerticalAlignment="Top" Width="48" Source="red.png" MouseLeftButtonDown="redballoon_click" Canvas.Left="194" Canvas.Top="161" RenderTransformOrigin="0.938,0.536" />

<Image Height="53" HorizontalAlignment="Left" Margin="0,0,0,0" x:Name="green_balloon" Stretch="Fill" VerticalAlignment="Top" Width="48" Source="green.png" MouseLeftButtonDown="redballoon_click" Canvas.Left="194" Canvas.Top="161" RenderTransformOrigin="0.938,0.536" />

**Code c#**

private void greenballoon_click(object sender, MouseButtonEventArgs e)
            {
                if (last_click =="red_balloon") // need a way to identify the last click was red_balloon
                 { 
                     PopBalloonCount++;
                 }
                else 
                 { 
                     PopBalloonCount--;
                 }
                score.Content = "Your Score" + " " + Convert.ToString(PopBalloonCount);
            }