Change the rectangle fill color using trigger in c# wpf ui

<Window x:Class="Train.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:local="clr-namespace:Train" mc:Ignorable="d" Title="MainWindow" Height="450" Width="800"> <Rectangle x:Name="redBrush" Width="20" Height="20" Fill="Red" Stroke="Black" RadiusX="2" RadiusY="2"> <Rectangle.Triggers> <EventTrigger RoutedEvent="Rectangle.MouseDown"> <BeginStoryboard> <Storyboard> <ColorAnimation Storyboard.TargetName="redBrush" Storyboard.TargetProperty="(Rectangle.Fill).Color" From="Red" To="Blue" /> </Storyboard> </BeginStoryboard> </EventTrigger> </Rectangle.Triggers> </Rectangle> </Window>

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