WP8 - XAML Grid column expanding when text is too long - wpf

Question

I have a grid with column definitions.
Whenever the text inside a column cell exceeds the designated width, it shrinks the left hand column down.
Here's an example
And this is my xaml markup
<ItemsControl Name="rfbItems" ItemsSource="{Binding}"
Style="{StaticResource contentItemsControl}">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<StackPanel Orientation="Vertical" Width="Auto" HorizontalAlignment="Left" />
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.ItemTemplate>
<DataTemplate>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="0.3*" />
<ColumnDefinition Width="0.7*" />
</Grid.ColumnDefinitions>
<TextBlock Grid.Column="0" Text="{Binding Title}" Style="{StaticResource App_Content_Grid}" TextAlignment="Left" />
<TextBlock Grid.Column="1" Text="{Binding Description}" Style="{StaticResource App_Content_Grid_Subtle}" />
</Grid>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
How should I restrict this behavior without losing responsiveness in the layout?
Also, if there is a better way to achieve what I'm trying to do here (inside the datatemplate), please feel free to share :)

Answer 1

Try setting margin and horizontal alignment to text boxes as below:
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="0.3*" />
<ColumnDefinition Width="0.7*" />
</Grid.ColumnDefinitions>
<TextBlock Grid.Column="0" Margin="5" HorizontalAlignment="Stretch" Text="{Binding Title}" Style="{StaticResource App_Content_Grid}" TextAlignment="Left" />
<TextBlock Grid.Column="1" Margin="5" HorizontalAlignment="Stretch" Text="{Binding Description}" Style="{StaticResource App_Content_Grid_Subtle}" />
</Grid>

Answer 2

The Grid doesn't have a limited width unless you give your StackPanel a fixed width. Setting Width="123" should work, HorizontalAlignment="Stretch" might do it as well (untested).

Answer 3

I'm sorry for all your efforts, but I found a solution.
None of the answers worked for me, so feel free to find a fitting solution and I'll accept your answer.
<ItemsControl Name="rfbItems" ItemsSource="{Binding}"
Style="{StaticResource contentItemsControl}">
<ItemsControl.ItemsPanel>
<ItemsPanelTemplate>
<StackPanel Orientation="Vertical" Width="Auto" HorizontalAlignment="Left" />
</ItemsPanelTemplate>
</ItemsControl.ItemsPanel>
<ItemsControl.ItemTemplate>
<DataTemplate>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="125" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<TextBlock Grid.Column="0" Text="{Binding Title}" Style="{StaticResource App_Content_Grid}" TextAlignment="Left" />
<TextBlock Grid.Column="1" Text="{Binding Description}" Style="{StaticResource App_Content_Grid_Subtle}" />
</Grid>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ItemsControl>
The first column has a fixed width, that's why the second column can't expand anymore.