I've got a ControlTemplate which does not display it's Background Color. I don't set anything in code or at other positions so I'm completly confused about this.

The ControlTemplate:

<ControlTemplate ... >
<RelativeLayout BackgroundColor="Green">

 <Grid BackgroundColor="Black"
 RelativeLayout.WidthConstraint="ConstraintExpression Type=RelativeToParent,Property=Width,Factor=1,Constant=0"
 RelativeLayout.HeightConstraint="ConstraintExpression Type=RelativeToParent,Property=Height,Factor=1,Constant=0">
 <Grid.RowDefinitions>
 <RowDefinition Height="*" />
 <RowDefinition Height="auto" />
 <RowDefinition Height="*" />
 </Grid.RowDefinitions>

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

 <ContentPresenter Grid.Row="1"
 Grid.Column="1" 
 BackgroundColor="Blue"/>

 </Grid>

</RelativeLayout>
</ControlTemplate>

And the View:

<ContentView ...
 ControlTemplate="x:TemplateBinding templates:OverlayViewTemplate">

<ContentView.Content>

 <Grid x:Name="GrdBase"
 BackgroundColor="White"
 VerticalOptions="Center"
 HorizontalOptions="Center">

 <Grid.GestureRecognizers>
 <TapGestureRecognizer Command="Binding ClickCommand" />
 </Grid.GestureRecognizers>

 <Grid.RowDefinitions>
 <RowDefinition Height="auto" />
 <RowDefinition Height="10" />
 <RowDefinition Height="auto" />
 </Grid.RowDefinitions>

 <Grid.ColumnDefinitions>
 <ColumnDefinition Width="100" />
 </Grid.ColumnDefinitions>

 <StackLayout Grid.Row="0"
 Grid.Column="0">
 <Label x:Name="LblTest"
 Text="Hello Xamarin.Forms!" />
 </StackLayout>
 </Grid>

</ContentView.Content>
</ContentView>

Do I miss something here or is a Template unable to render a background color?

Edit

After a lot of testing around, I found out that the Template is not used by the ContentView. Even if I define the template inside my App.xaml and referencing it via ControlTemplate="StaticResource ViewTemplate". I have got an other Template which is used by my pages and this works with no issue, so is there a bug when using it with a View?