Vertically align a WPF RadioButton bullet and stretch its contents - wpf

Question

I want to use a grid, stretched across the entire available area, as the content for a RadioButton, and I want the RadioButton's bullet to be vertically aligned.
Getting the grid to stretch across the entire area is easy enough, I just set the HorizontalContentAlignment property on the RadioButton:
<RadioButton HorizontalContentAlignment="Stretch">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<TextBlock>Foo</TextBlock>
<TextBox Grid.Column="1"/>
<TextBlock Grid.Row="1">The quick brown fox</TextBlock>
<TextBox Grid.Row="1" Grid.Column="1"/>
</Grid>
</RadioButton>
And following Simon Weaver's answer to this older question, I can vertically align the radio button's bullet relatively easily:
<RadioButton HorizontalContentAlignment="Stretch">
<TextBlock Grid.IsSharedSizeScope="True">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" SharedSizeGroup="A"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<TextBlock>Foo</TextBlock>
<TextBox Grid.Column="1"/>
</Grid>
<LineBreak/>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" SharedSizeGroup="A"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<TextBlock Grid.Row="1">The quick brown fox</TextBlock>
<TextBox Grid.Row="1" Grid.Column="1"/>
</Grid>
</TextBlock>
</RadioButton>
The trouble is, having done that, the content no longer stretches.
How can I get a vertically aligned bullet and a stretching grid?

Answer 1

The TextBlock is being stretched properly, but the grid inside it is not. Presumably that's just the way TextBlock works.
The following is a bit hacky, but it works:
<RadioButton HorizontalContentAlignment="Stretch">
<TextBlock Name="Text" Grid.IsSharedSizeScope="True">
<Grid Width="{Binding ElementName=Text, Path=ActualWidth}">

Answer 2

This would work for the visual effect. You didn't list any functional requirements so i'm not sure if it will work for you without some event mapping or not.
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<RadioButton Grid.Column="0" Grid.RowSpan="2" Content=""/>
<TextBlock Grid.Column="1">Foo</TextBlock>
<TextBox Grid.Column="2"/>
<TextBlock Grid.Row="1" Grid.Column="1">The quick brown fox</TextBlock>
<TextBox Grid.Row="1" Grid.Column="2"/>
</Grid>