Larger space between Groups Gridview

Question

Hello!

I read some similar posts,but i didn't found the "easy" solution.

My problem is ,i want more space between groups in gridview.

My XML code :

<Page
    x:Class="App1.BlankPage2"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:App1"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d" Background="Black">


    <Page.Resources>
        <CollectionViewSource x:Name="cvs1" IsSourceGrouped="true" />

    </Page.Resources>

    <Grid VerticalAlignment="Stretch" HorizontalAlignment="Stretch" Background="Gray" >
        <GridView x:Name="ItemsByCategory"  VerticalAlignment="Center" 
                                      ItemsSource="{Binding Source={StaticResource cvs1}}"
                                      BorderBrush="{StaticResource ApplicationForegroundThemeBrush}" 
                  
                 
            Padding="116,137,40,46"
                  >

            <GridView.ItemsPanel>
                <ItemsPanelTemplate>
                    <StackPanel Orientation="Horizontal" Margin="100"/>

                </ItemsPanelTemplate>
            </GridView.ItemsPanel>
            

            <GridView.ItemTemplate>
                
                <DataTemplate>
                   
                    <Grid HorizontalAlignment="Stretch" Background="Green" >
                       
                        <StackPanel Orientation="Horizontal" Margin="1,10,0,0">
                            <Image Source="{Binding Image}" Height="60" Width="60" VerticalAlignment="Center"  Margin="0,0,10,0"/>
                            <StackPanel Margin="0,0,0,0" Orientation="Vertical" Width="100" Height="150">
                                <TextBlock TextWrapping="Wrap" Width="100" VerticalAlignment="Bottom" Text="{Binding Title}" HorizontalAlignment="Center" FontFamily="Segoe UI" />
                                
                            </StackPanel>
                            
                        </StackPanel>

                    </Grid>
                  
                </DataTemplate>
            </GridView.ItemTemplate>
            <!--- header   -->
            <GridView.GroupStyle>
                <GroupStyle>
                    <GroupStyle.HeaderTemplate>
                        <DataTemplate>

                            <Grid >
                                <Button
                                    AutomationProperties.Name="Group Title"
                                    Style="{StaticResource TextPrimaryButtonStyle}">
                                    <StackPanel Orientation="Horizontal">
                                        <TextBlock Text='{Binding Key}'  FontSize="30" Margin="5" Style="{StaticResource GroupHeaderTextStyle}"/>
                                      
                                    </StackPanel>
                                </Button>
                            </Grid>
                        </DataTemplate>
                    </GroupStyle.HeaderTemplate>

                    <GroupStyle.Panel>
                        <ItemsPanelTemplate>
                            <VariableSizedWrapGrid Orientation="Vertical" Height="800" />
                        </ItemsPanelTemplate>
                    </GroupStyle.Panel>
                </GroupStyle>

            </GridView.GroupStyle>

        </GridView>
        <TextBlock HorizontalAlignment="Left" Margin="118,60,0,0" TextWrapping="Wrap" Text="Test" VerticalAlignment="Top" FontSize="60" Foreground="White"/>






    </Grid>
</Page>

Thx,for any help !