Stretch row content to fill empty space - xaml

Question

I am not able to get this working. I have a page to show some info and I have divided it into 6 rows. I want that each row take space as they do now but the latest one (which has a map and an image) takes all left till it fill the space.
This is my xaml:
<phone:PhoneApplicationPage
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"
xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:Maps="clr-namespace:Microsoft.Phone.Controls.Maps;assembly=Microsoft.Phone.Controls.Maps"
xmlns:toolkit="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone.Controls.Toolkit"
xmlns:UI="clr-namespace:Microsoft.Advertising.Mobile.UI;assembly=Microsoft.Advertising.Mobile.UI"
x:Class="MyApp.EventMoreInfoNoPhoto"
FontFamily="{StaticResource PhoneFontFamilyNormal}"
FontSize="{StaticResource PhoneFontSizeNormal}"
Foreground="{StaticResource PhoneForegroundBrush}"
SupportedOrientations="Portrait" Orientation="Portrait"
mc:Ignorable="d"
shell:SystemTray.IsVisible="True">
<StackPanel x:Name="swippingSurface">
<Grid x:Name="LayoutRoot"
HorizontalAlignment="Stretch"
Margin="0,0,0,0"
VerticalAlignment="Stretch"
Background="Transparent">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="1*"/>
<ColumnDefinition Width="1*"/>
<ColumnDefinition Width="1*"/>
<ColumnDefinition Width="1*"/>
<ColumnDefinition Width="1*"/>
<ColumnDefinition Width="1*"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
<RowDefinition Height="*"/>
<RowDefinition Height="*"/>
<RowDefinition Height="*"/>
<RowDefinition Height="*"/>
<RowDefinition Height="*"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<Border Grid.Row="0"
Grid.ColumnSpan="6"
BorderThickness="0"
BorderBrush="DarkRed">
<Border.Background>
<LinearGradientBrush EndPoint="1,0" StartPoint="1,1">
<GradientStop Color="DarkRed" Offset="0" />
<GradientStop Color="DarkRed" Offset="1" />
</LinearGradientBrush>
</Border.Background>
</Border>
<Border Grid.Row="1"
Grid.Column="0"
Grid.ColumnSpan="1"
BorderThickness="0"
BorderBrush="Red">
<Border.Background>
<LinearGradientBrush EndPoint="1,0" StartPoint="1,1">
<GradientStop Color="Red" Offset="0" />
<GradientStop Color="Red" Offset="1" />
</LinearGradientBrush>
</Border.Background>
</Border>
<Border Grid.Row="2"
Grid.Column="0"
Grid.ColumnSpan="1"
BorderThickness="0"
BorderBrush="Red">
<Border.Background>
<LinearGradientBrush EndPoint="1,0" StartPoint="1,1">
<GradientStop Color="Red" Offset="0" />
<GradientStop Color="Red" Offset="1" />
</LinearGradientBrush>
</Border.Background>
</Border>
<Border Grid.Row="3"
Grid.Column="0"
Grid.ColumnSpan="1"
BorderThickness="0"
BorderBrush="Red">
<Border.Background>
<LinearGradientBrush EndPoint="1,0" StartPoint="1,1">
<GradientStop Color="Red" Offset="0" />
<GradientStop Color="Red" Offset="1" />
</LinearGradientBrush>
</Border.Background>
</Border>
<Border Grid.Row="4"
Grid.Column="0"
Grid.ColumnSpan="1"
BorderThickness="0"
BorderBrush="Red">
<Border.Background>
<LinearGradientBrush EndPoint="1,0" StartPoint="1,1">
<GradientStop Color="Red" Offset="0" />
<GradientStop Color="Red" Offset="1" />
</LinearGradientBrush>
</Border.Background>
</Border>
<Border Grid.Row="5"
Grid.Column="0"
Grid.ColumnSpan="1"
BorderThickness="0"
BorderBrush="Red">
<Border.Background>
<LinearGradientBrush EndPoint="1,0" StartPoint="1,1">
<GradientStop Color="Red" Offset="0" />
<GradientStop Color="Red" Offset="1" />
</LinearGradientBrush>
</Border.Background>
</Border>
<Border Grid.Row="6"
Grid.RowSpan="2"
Grid.Column="0"
x:Name="photo_border"
Grid.ColumnSpan="1"
BorderThickness="0"
BorderBrush="Red">
<Border.Background>
<LinearGradientBrush EndPoint="1,0" StartPoint="1,1">
<GradientStop Color="Red" Offset="0" />
<GradientStop Color="Red" Offset="1" />
</LinearGradientBrush>
</Border.Background>
</Border>
<Border Grid.Row="2" Grid.Column="1"
Grid.ColumnSpan="5"
BorderThickness="0"
Opacity="0.3"
BorderBrush="DarkGray">
<Border.Background>
<LinearGradientBrush EndPoint="1,0" StartPoint="1,1">
<GradientStop Color="DarkGray" Offset="0" />
<GradientStop Color="DarkGray" Offset="1" />
</LinearGradientBrush>
</Border.Background>
</Border>
<Border Grid.Row="4" Grid.Column="1"
Grid.ColumnSpan="5"
BorderThickness="0"
Opacity="0.3"
BorderBrush="DarkGray">
<Border.Background>
<LinearGradientBrush EndPoint="1,0" StartPoint="1,1">
<GradientStop Color="DarkGray" Offset="0" />
<GradientStop Color="DarkGray" Offset="1" />
</LinearGradientBrush>
</Border.Background>
</Border>
<Image HorizontalAlignment="Center"
Grid.Row="0"
Grid.Column="4"
Source="/Resources/text_black.png"
VerticalAlignment="Center"
Width="40"
Margin="0,0,0,0"/>
<Image HorizontalAlignment="Center"
Grid.Row="0"
Grid.Column="5"
Source="/Resources/big_map_white.png"
VerticalAlignment="Center"
Width="40"
Margin="0,0,0,0"/>
<TextBlock Text="Info"
VerticalAlignment="Center"
HorizontalAlignment="Center"
Grid.Column="0"
Margin="0,0,0,0"
Style="{StaticResource PhoneTextNormalStyle}"/>
<Image HorizontalAlignment="Center"
Source="/Resources/label.png"
Height="65"
VerticalAlignment="Center"
Width="69"
Grid.Row="1"
Margin="0,0,0,0"/>
<Image HorizontalAlignment="Center"
Height="65"
Grid.Row="2"
Source="/Resources/label.png"
VerticalAlignment="Center"
Width="69"
Margin="0,0,0,0"/>
<Image HorizontalAlignment="Center"
Height="65"
Grid.Row="3"
Source="/Resources/calendar.png"
VerticalAlignment="Center"
Width="69"
Margin="0,0,0,0"/>
<Image HorizontalAlignment="Center"
Height="65"
Grid.Row="4"
Source="/Resources/calendar.png"
VerticalAlignment="Center"
Width="69"
Margin="0,0,0,0"/>
<Image HorizontalAlignment="Center"
Height="65"
Grid.Row="5"
Source="/Resources/comment.png"
VerticalAlignment="Center"
Width="69"
Margin="0,0,0,0"/>
<Image HorizontalAlignment="Center"
x:Name="map_icon"
Height="65"
Grid.Row="6"
Source="/Resources/map_white.png"
VerticalAlignment="Center"
Width="69"
Margin="0,0,0,0"/>
<TextBlock HorizontalAlignment="Left"
x:Name="list_event_topic"
Grid.Column="1"
Margin="0,0,0,0"
TextWrapping="Wrap"
Text=""
Grid.Row="1"
Grid.ColumnSpan="5"/>
<TextBlock HorizontalAlignment="Left"
x:Name="list_event_title"
Grid.Column="1"
Margin="0,0,0,0"
Grid.Row="2"
Grid.ColumnSpan="5"
TextWrapping="Wrap"
Text=""/>
<TextBlock HorizontalAlignment="Left"
x:Name="date_init"
Margin="0,0,0,0" TextWrapping="Wrap"
Text=""
VerticalAlignment="Top"
Grid.Row="3"
Grid.Column="1"
Grid.ColumnSpan="5"/>
<TextBlock HorizontalAlignment="Left"
x:Name="date_end"
Margin="0,0,0,0"
TextWrapping="Wrap"
Text=""
VerticalAlignment="Top"
Grid.Row="4"
Grid.Column="1"
Grid.ColumnSpan="5"/>
<TextBlock Grid.Column="1"
x:Name="comment_area"
HorizontalAlignment="Left"
Margin="10,10,0,0"
Grid.Row="5"
TextWrapping="Wrap"
Text=""
VerticalAlignment="Top"
Grid.ColumnSpan="5"
/>
<Maps:Map x:Name="map_event_detail"
Grid.ColumnSpan="5"
HorizontalAlignment="Stretch"
Margin="0,0,0,0"
Grid.Column="1"
Tap="onTapMap"
Grid.Row="6"
Width="auto"
VerticalAlignment="Stretch"
>
<Maps:Pushpin x:Name="pinEvent"
Background="Green"
BorderBrush="Black"
BorderThickness="1"
Visibility="Collapsed" />
</Maps:Map>
</Grid>
</StackPanel>
</phone:PhoneApplicationPage>
But my problem is that after the map ends, there are some empty space. I have tried using Stretch in VerticalAligment but I can't.
What am I doing wrong here? I am sure it is something stupid.