I'm learning WPF and can't figure out how to enfore my buttons to take a square shape.

Here is my XAML Markup:

<Window x:Class="Example"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Height="368" Width="333">
  <Window.Resources>
    <Style x:Key="ToggleStyle" BasedOn="{StaticResource {x:Type ToggleButton}}"
                            TargetType="{x:Type RadioButton}">
    </Style>
  </Window.Resources>
  <RadioButton Style="{StaticResource ToggleStyle}">
        Very very long text
  </RadioButton>
</Window>

Specifying explicit values for Width and Height attributes seems like a wrong idea - the button should calculate its dimensions based on its contents automagically, but keep its width and height equal. Is this possible?