VerticalAlignment="Stretch" for label inside canvas doesn't work

Question

How to use VerticalAlignment="Stretch" with a Label inside a Canvas? I'm trying to center the text "Cancel" in the button as in the code below. To use fixed height and width for the label isn't a desired option.

<Button Name="buttonCancel" Width="80" Height="40" IsCancel="True" Padding="0" HorizontalContentAlignment="Stretch" VerticalContentAlignment="Stretch">
    <Canvas>
        <Label Canvas.Top="0" Canvas.Left="0" Padding="0" FontSize="10">Esc</Label>
        <Label VerticalContentAlignment="Center" HorizontalContentAlignment="Center" VerticalAlignment="Stretch" HorizontalAlignment="Stretch">Cancel</Label>
    </Canvas>
</Button>

Answer 1

Use a binding to the Canvas's ActualWidth:

<Canvas>
    <Label Width="{Binding RelativeSource={RelativeSource AncestorType={x:Type Canvas}}, Path=ActualWidth}">...</Label>
</Canvas>

But as mentioned above, if you are interested in dynamic stretching layouts, the Canvas is not the ideal choice of control.