How to add Buttons inside of MapControl Windows Phone 8.1 - windows-runtime

Question

I want to put two Buttons in my MapControl, one to zoom in, and other to zoom out, here's my CS file with a code,what i did here i use the
MapControl1.ZoomLevel = 15; , but how i can put this inside a button?
public async void mapas2()
{
Geolocator geolocator = new Geolocator();
Geoposition geoposition = null;
try
{
geoposition = await geolocator.GetGeopositionAsync();
}
catch (Exception ex)
{
MessageDialog ms = new MessageDialog("Erro GPS, Por favor, acesse as configurações de seu Windows Phone," + Environment.NewLine +
"na opção LOCALIZAÇÃO e habilite o Serviço de Localização");
ms.ShowAsync();
}
MapControl1.Center = geoposition.Coordinate.Point;
MapControl1.ZoomLevel = 15;
MapIcon mapIcon = new MapIcon();
mapIcon.NormalizedAnchorPoint = new Point(0.25, 0.9);
mapIcon.Location = geoposition.Coordinate.Point;
mapIcon.Title = "Você está aqui....";
MapControl1.MapElements.Add(mapIcon);
}

Answer 1

You can place these buttons with your map control in one Grid in XAML, so the will look like they're on the map.
Example:
<Grid>
<Maps:MapControl />
<StackPanel HorizontalAlignment="Center"
VerticalAlignment="Bottom"
Orientation="Horizontal"
Margin="24">
<Button Content="+"
Margin="12"
MinWidth="40" />
<Button Content="-"
Margin="12"
MinWidth="40" />
</StackPanel>
</Grid>

Answer 2

Just few more lines to Łukasz Rejman answer
<StackPanel HorizontalAlignment="Center" VerticalAlignment="Bottom" Orientation="Horizontal" Margin="15">
<Button x:Name="ZooOut" Content="-" Margin="5" MinWidth="60" MinHeight="60" Tapped="ZooOut_Tapped" />
<Button x:Name="ZoomIn" Content="+" Margin="5" MinWidth="60" MinHeight="60" Tapped="ZoomIn_Tapped" />
</StackPanel>
Button Tapped Event:
private void ZoomIn_Tapped(object sender, TappedRoutedEventArgs e)
{
if (CustomMapControl.ZoomLevel < 20)
{
if (CustomMapControl.ZoomLevel > 19)
CustomMapControl.ZoomLevel = 20;
else
CustomMapControl.ZoomLevel++;
}
}
private void ZooOut_Tapped(object sender, TappedRoutedEventArgs e)
{
if (CustomMapControl.ZoomLevel > 1)
{
if (CustomMapControl.ZoomLevel < 2)
CustomMapControl.ZoomLevel = 1;
else
CustomMapControl.ZoomLevel--;
}
}