<Canvas x:Name="parentCanvas"
        xmlns="http://schemas.microsoft.com/client/2007" 
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
	Width="640" Height="200"  MouseLeftButtonUp="switch_fs">

	<TextBlock Canvas.Left="250" Canvas.Top= "90" Width="80" Height="18" Text="Click me" />
</Canvas>
