Image Button does not work when use click event to update BackgroundImage property

<ImageButton Grid.Row="5" Source="restbutton.png" Clicked="ImageButton_Clicked" VerticalOptions="Center" HorizontalOptions="Center" WidthRequest="100" HeightRequest="100" BorderColor="Red" />
<telerik:RadButton Grid.Row="6" BackgroundImage="restbutton.png" VerticalOptions="Center" HorizontalOptions="Center" WidthRequest="100" HeightRequest="100" Clicked="RadButton_Clicked"/>
        

        private void RadButton_Clicked(object sender, EventArgs e)
	{
		(sender as Telerik.Maui.Controls.RadButton).BackgroundImage = "focusbutton.png";
	}

	private void ImageButton_Clicked(object sender, EventArgs e)
	{
		(sender as ImageButton).Source = "focusbutton.png";
	}