Textblock textwrapping not working - wpf

Question

Can somebody give me an idea of why the Wrapping is not working inide these Textblocks?
I just don't know why, i changed all my stackpanels to grids to avoid the infinite space issue, but still it doesn't work...
<Border x:Name="SummaryRightSideContainerBorder" Grid.Column="1"
Margin="10,10,10,10" BorderBrush="Black"
BorderThickness="1">
<ContentControl x:Name="SummaryRightSideContainerContentControl" Content="{Binding SelectedItem, ElementName=SummaryTreeView}">
<ContentControl.Resources>
<DataTemplate DataType="{x:Type ViewModelsProject:ProjectViewModel}">
<StackPanel>
<TextBlock Text="Displaying Project DataContract stuff..." />
</StackPanel>
</DataTemplate>
<DataTemplate DataType="{x:Type ViewModelsProject:SequenceViewModel}">
<StackPanel>
<TextBlock Text="Displaying Sequence DataContract stuff..." />
</StackPanel>
</DataTemplate>
<DataTemplate DataType="{x:Type ViewModelsProject:GroupViewModel}">
<StackPanel>
<DataGrid Margin="10" AutoGenerateColumns="False"
Background="Transparent" BorderThickness="0"
CanUserAddRows="False"
CellStyle="{DynamicResource dgCellStyle}"
ColumnHeaderStyle="{DynamicResource dgHeader}"
DataContext="{Binding ElementName=SummaryTreeView,
Path=SelectedItem}"
GridLinesVisibility="None"
ItemsSource="{Binding Standards}"
Padding="0" RowHeaderWidth="0" ScrollViewer.HorizontalScrollBarVisibility="Disabled">
<DataGrid.Resources>
<Style x:Key="dgHeader" TargetType="{x:Type DataGridColumnHeader}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type DataGridColumnHeader}">
<TextBlock Width="{TemplateBinding Width}"
Padding="5"
Text="{TemplateBinding Content}"
TextAlignment="Left">
<TextBlock.Background>
<LinearGradientBrush StartPoint="0,0" EndPoint="0,1">
<GradientStop Offset="0.0" Color="#373638" />
<GradientStop Offset="1.0" Color="#77797B" />
</LinearGradientBrush>
</TextBlock.Background>
</TextBlock>
</ControlTemplate>
</Setter.Value>
</Setter>
<Setter Property="OverridesDefaultStyle" Value="True" />
<Setter Property="Background" Value="Green" />
<Setter Property="Foreground" Value="White" />
<Setter Property="FontSize" Value="12" />
<Setter Property="Background">
<Setter.Value>
<LinearGradientBrush StartPoint="0,0" EndPoint="0,1">
<GradientStop Offset="0.0" Color="#373638" />
<GradientStop Offset="1.0" Color="#77797B" />
</LinearGradientBrush>
</Setter.Value>
</Setter>
</Style>
<Style x:Key="dgCellStyle" TargetType="{x:Type DataGridCell}">
<Style.Triggers>
<Trigger Property="DataGridCell.IsSelected" Value="True">
<Setter Property="Background" Value="White" />
<Setter Property="Foreground" Value="Black" />
<Setter Property="BorderThickness" Value="0" />
</Trigger>
</Style.Triggers>
</Style>
</DataGrid.Resources>
<DataGrid.Columns>
<DataGridTemplateColumn Header="Standards">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<Grid Margin="5">
<Grid.RowDefinitions>
<RowDefinition />
<RowDefinition />
</Grid.RowDefinitions>
<TextBlock Grid.Row="0" Text="{Binding Path=StepMaster.Description}" VerticalAlignment="Center" FontWeight="SemiBold"/>
<Grid Grid.Row="1">
<Grid.RowDefinitions>
<RowDefinition />
<RowDefinition />
<RowDefinition />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<TextBlock Grid.Row="0" Grid.Column="0" Text="Standard: " VerticalAlignment="Top"/>
<TextBlock Grid.Row="0" Grid.Column="1" Text="{Binding Path=Standard}" Margin="5,0,0,0" VerticalAlignment="Top" TextWrapping="Wrap"/>
<TextBlock Grid.Row="1" Grid.Column="0" Text="Details: " VerticalAlignment="Top"/>
<TextBlock Grid.Row="1" Grid.Column="1" Text="{Binding Path=Details}" Margin="5,0,0,0" VerticalAlignment="Top" TextWrapping="Wrap"/>
<TextBlock Grid.Row="2" Grid.Column="0" Text="Comments: " VerticalAlignment="Top"/>
<TextBlock Grid.Row="2" Grid.Column="1" Text="{Binding Path=Comments}" Margin="5,0,0,0" VerticalAlignment="Top" TextWrapping="Wrap"/>
</Grid>
</Grid>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
</DataGrid.Columns>
</DataGrid>
</StackPanel>
</DataTemplate>
<DataTemplate DataType="{x:Type ViewModelsProject:StepViewModel}">
<UniformGrid Rows="3">
<TextBlock Margin="10" FontWeight="DemiBold"
Text="Standards" />
<TextBlock Margin="10" FontWeight="DemiBold"
Text="Standards Details" />
<StackPanel Orientation="Vertical">
<DataGrid Margin="10" AutoGenerateColumns="False"
<Another data grid is here />
</DataGrid>
</StackPanel>
</UniformGrid>
</DataTemplate>
</ContentControl.Resources>
</ContentControl>
</Border>

Answer 1

Turns out the only way to make this work is to use properties directly in the DataGrid:
MaxWidth="{Binding ElementName=SummaryRightSideContainerBorder, Path=ActualWidth}" ColumnWidth="*"
MaxWidth is used so that the Datagrid itself does not exceed its container boundaries and ColumnWidth is used so that the columns use 100% of the space available in the datagrid.
Blam's answer put me in the right track to find the solution.

Answer 2

As an answer you need to set second column to
<ColumnDefinition Width="*"/>
so it is constrained. * mean the size of the container. Right now it is growing outside the container (screen)
first column auto is OK