xamarin forms uwp button hover
<Button Background="Red" Foreground="Black"> <!-- These are only applied when your button is not being hovered-->
<Button.Resources>
<ResourceDictionary>
<ResourceDictionary.ThemeDictionaries>
<ResourceDictionary x:Key="Dark">
<SolidColorBrush x:Key="ButtonForegroundPointerOver" Color="Red"/>
<SolidColorBrush x:Key="ButtonBackgroundPointerOver" Color="Black"/>
</ResourceDictionary>
<ResourceDictionary x:Key="Light">
<SolidColorBrush x:Key="ButtonForegroundPointerOver" Color="Red"/>
<SolidColorBrush x:Key="ButtonBackgroundPointerOver" Color="Black"/>
</ResourceDictionary>
</ResourceDictionary.ThemeDictionaries>
</ResourceDictionary>
</Button.Resources>
</Button>