I am having a grid and some controls inside it i have inserted a link to view the screen
http://i.imgur.com/y2BKKVP.jpg[
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<Page
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2006" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d"
xmlns:Custom="http://schemas.microsoft.com/winfx/2006/xaml/composite-font"
x:Class="FlukeDataDog.Preferences"
HorizontalAlignment="Stretch" Margin="1,0,0,0"
VerticalAlignment="Top" Width="Auto" Height="Auto" x:Name="pgePreferences" KeyDown="pgePreferences_KeyDown" Focusable="False">
<Page.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="..\Resources\FlukeBasicTheme.xaml"/>
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Page.Resources>
<GroupBox x:Name="grpLanguage" Height="300" Margin="2,0,2,2" Focusable="False" >
<Grid x:Name="grdMain" Width="Auto" Height="Auto" Margin="0,0,0,0">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="550"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="210"/>
<RowDefinition Height="10"/>
<RowDefinition Height="40"/>
</Grid.RowDefinitions>
<Button Margin="0,0,0,0" x:Name="btnApply" Content="Apply" HorizontalAlignment="Center" VerticalAlignment="Center" Width="80" Height="23" Visibility="Hidden" />
<Border d:LayoutOverrides="HorizontalAlignment, VerticalAlignment" CornerRadius="15,15,15,15" Focusable="False" x:Name="bdLanguage" removed="#FFA89A6E" BorderBrush="#FF8E8B82" Margin="0,0,-151,0" >
<Grid Width="Auto" Height="Auto" VerticalAlignment="Stretch">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="0.359*"/>
<ColumnDefinition Width="0.28*"/>
<ColumnDefinition Width="0.361*"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="0"/>
<RowDefinition Height="11"/>
<RowDefinition Height="44"/>
<RowDefinition Height="54.5"/>
<RowDefinition Height="50"/>
<RowDefinition Height="40.5"/>
<RowDefinition Height="20"/>
</Grid.RowDefinitions>
<Label x:Name="lblCurrentLanguage" Height="23" Focusable="False" Content="" Width="Auto" Visibility="Hidden" HorizontalAlignment="Left" VerticalAlignment="Top" Grid.Row="1" Grid.RowSpan="2"/>
<Label x:Name="lblCurrentLanguageDisplay" Height="23" Focusable="False" Visibility="Hidden" HorizontalAlignment="Left" Margin="60,0,0,0" VerticalAlignment="Top" Grid.Column="0" Grid.Row="1" Grid.RowSpan="2"/>
<Label x:Name="lblSelectLanguage" Content="" Width="Auto" Focusable="False" Height="23" HorizontalAlignment="Left" VerticalAlignment="Center" Margin="15,0,0,0" Grid.Row="2" />
<ComboBox ItemsSource="{Binding}" x:Name="cmbSelectLanguage" IsSynchronizedWithCurrentItem="True" SelectionChanged="cmbSelectLanguage_SelectionChanged" Height="25" HorizontalAlignment="Stretch" MinHeight="0" MinWidth="0" VerticalAlignment="Center" Grid.Column="1" Grid.Row="2" Grid.ColumnSpan="1" Margin="3,0,3,0" Width="175" />
<Label x:Name="lblSelectDateFormat" Focusable="False" HorizontalAlignment="Left" Margin="15,0,0,0" VerticalAlignment="Center" Grid.Row="3" Grid.RowSpan="1"/>
<ComboBox x:Name="cmbDateFormat" SelectionChanged="cmbDateFormat_SelectionChanged" Height="25" Grid.Column="1" Grid.Row="3" Grid.ColumnSpan="1" VerticalAlignment="Center" Margin="3,0,3,0" Width="175" />
<Label x:Name="lblSelectTimeFormat" Focusable="False" Height="23" HorizontalAlignment="Left" VerticalAlignment="Center" Grid.Row="4" Margin="15,0,0,0"/>
<ComboBox x:Name="cmbTimeFormat" SelectionChanged="cmbTimeFormat_SelectionChanged" Height="25" Margin="3,7.5,3,12.5" VerticalAlignment="Stretch" Grid.Column="1" Grid.Row="4" Grid.ColumnSpan="1" Width="175" />
<ComboBox RenderTransformOrigin="0.5,0.5" x:Name="cmbUnits" VerticalAlignment="Center" Height="25" Grid.Column="1" Grid.Row="5" IsSynchronizedWithCurrentItem="True" SelectionChanged="cmbUnits_SelectionChanged" Grid.ColumnSpan="1" Margin="3,0,3,0" Width="175" />
<Label HorizontalAlignment="Left" Focusable="False" Margin="15,0,0,0" x:Name="lblSelectUnit" VerticalAlignment="Center" Height="23" VerticalContentAlignment="Center" Content="" Grid.Row="5"/>
<ComboBox HorizontalAlignment="Stretch" x:Name="cmbSelectSubUnits" Grid.Row="5" IsSynchronizedWithCurrentItem="True" Grid.Column="2" Grid.RowSpan="1" Grid.ColumnSpan="1" SelectionChanged="cmbSubUnits_SelectionChanged" Margin="9.5,0,68.5,0" Height="25" VerticalAlignment="Center" Width="175" />
<Label HorizontalAlignment="Left" x:Name="lblSelectSubUnit" Focusable="False" VerticalAlignment="Center" Content="" Grid.Row="5" VerticalContentAlignment="Center" Margin="15,0,0,0" Grid.RowSpan="1" Visibility="Hidden"/>
<ComboBox RenderTransformOrigin="0.5,0.5" x:Name="cmbOVUnits" VerticalAlignment="Center" Height="25" Grid.Column="1" Grid.Row="6" IsSynchronizedWithCurrentItem="True" Grid.ColumnSpan="1" Margin="3,0,3,0" Width="175" />
<Label x:Name="lblOVUnit" Content="Select OV Unit" Width="Auto" Focusable="False" Height="23" HorizontalAlignment="Left" VerticalAlignment="Center" Margin="15,0,0,0" Grid.Row="7" />
</Grid>
</Border>
<Border d:LayoutOverrides="HorizontalAlignment, VerticalAlignment" CornerRadius="15,15,15,15" Focusable="False" x:Name="bdAutoStart" removed="#FFA89A6E" BorderBrush="#FF8E8B82" Margin="0,0,-151,0" Grid.Row="3" >
<CheckBox HorizontalAlignment="Left" Focusable="False" Margin="15,0,0,0" VerticalAlignment="Center" Height="23" VerticalContentAlignment="Center" Content="" x:Name="chkAutoShow" Checked="chkAutoDisplay_Checked" Unchecked="chkAutoDisplay_Unchecked" />
</Border>
</Grid>
</GroupBox>
</Page>
But when i add a new label it is not stretching i am unable to see the label and combobox fully.