StackLayout overflow my cell grid.

Hello friends,

I do a project using reusable controls and i have a problem when i use several views in a stacklayout when it is contained in a cell grid, the stacklayout overflow the cell.
To explain my issue , i show you with a simple project.

This project is divided in three xaml

My main page : the page is divided in four cell grid.

  <Grid Padding="10" >
    <Grid.RowDefinitions>
      <RowDefinition Height="0.50*"/>
      <RowDefinition Height="0.50*"/>
    </Grid.RowDefinitions>

    <Grid.ColumnDefinitions>
      <ColumnDefinition Width="0.50*"/>
      <ColumnDefinition Width="0.50*"/>
    </Grid.ColumnDefinitions>

    <c:Container  VerticalOptions="FillAndExpand" HorizontalOptions="FillAndExpand" Grid.Column="0" Grid.Row="0"/>

    <StackLayout Grid.Column="1" Grid.Row="0" BackgroundColor="Transparent">
      <Label x:Name="label2" Text="TWO" TextColor="Green"/>
    </StackLayout>

    <StackLayout Grid.Column="0" Grid.Row="1" BackgroundColor="Transparent">
      <Label x:Name="label3" Text="THREE" TextColor="Red"/>
    </StackLayout>

    <StackLayout Grid.Column="1" Grid.Row="1" BackgroundColor="Transparent">
      <Label x:Name="label4" Text="FOUR" TextColor="Gray"/>
    </StackLayout>

  </Grid>

My container : the container can be used in other cell. in this simple project , this container contain only my reusable control.

  <StackLayout VerticalOptions="FillAndExpand" HorizontalOptions="FillAndExpand">
    <controls:Control />
    <!--<Button Text="OK" />-->
  </StackLayout>

My reusable control : This control can be used in other project.

  <StackLayout Orientation="Vertical" VerticalOptions="FillAndExpand">
    <Label x:Name="label1" BackgroundColor="Blue" />
    <Label x:Name="label2" BackgroundColor="Teal" />
  </StackLayout>

Result : we can see my reusable control overflow the first cell grid. (screen_1)

I want the same result than when i have only one label in the reusable control , the stacklayout (control) doesn't overflow. (screen_2)

source : https://github.com/Masivo91/Xamarin/tree/master/TestGrid/TestGrid/TestGrid

Thanks in advance.