Styles on buttons with children - button

Question

I have a question about styles. In my Windows Universal application I have certain buttons. These buttons have a stackpanel as a child and the stackpanel has an image as a child. The purpose of this is that the button needs to contain an image.
Now my employer wants to ignore the theme settings of the user. So whenever a button is clicked he doesn't want the background color of the button to change. The only way I've found so far to do this is with a style. However when I use a style the button is displayed without it's children. The style I made looks like this:
<Style x:Key="Button_style" TargetType="Button">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="Button">
<Grid>
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="CommonStates">
<VisualState x:Name="Pressed">
</VisualState>
<VisualState x:Name="Disabled"/>
<VisualState x:Name="PointerOver">
</VisualState>
<VisualState x:Name="Pointerleave">
</VisualState>
</VisualStateGroup>
<VisualStateGroup x:Name="FocusStates">
<VisualState x:Name="Focused"/>
<VisualState x:Name="PointerFocused"/>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
This was a proof of concept. However since the children of the buttons dissapear I'm unable to go on. How would I rewrite this style to make the children of the button stay where they are supposed to be?
Here is some sample code of the button I have:
<Button Name="MyButton" Click="MyButton_Click" ClickMode="Press" HorizontalAlignment="Center" VerticalAlignment="Stretch" >
<StackPanel VerticalAlignment="Top" HorizontalAlignment="Left" >
<Image Name="MyImage" x:Uid="MyImage" Source="" VerticalAlignment="Top" HorizontalAlignment="Left" MaxWidth="30" />
</StackPanel>
</Button>

Answer 1

If you want to ignore user settings at all the best option will be just override PhoneAccentBrush value. You can do it in App.xaml, or use ResourceDistionary.
<Color x:Key="PhoneAccentColor">Blue</Color>
Also it is possible to request light or dark theme for your application in App.xaml:
<Application x:Class="App1.App"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:App2"
RequestedTheme="Light">
</Application>