Xamarin styles doesn't work - xamarin.forms - xaml

Question

my Application is always with a white screen if I use style.
When I debugged I found out it doesn't leave the line
InitializeComponent();
that is in the app xaml cs
it builds, but after gets white screen forever.
this is my app xaml:
<?xml version="1.0" encoding="utf-8" ?>
<Application xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="neoFly_Montana.App">
<Application.Resources>
<!-- Application resource dictionary -->
<ResourceDictionary>
<Color x:key="BackButton">Black</Color>
<Style x:Key="button" TargetType ="but">
<Setter Property="BackgroundColor" Value="{StaticResource BackButton}"/>
</Style>
</ResourceDictionary>
</Application.Resources>
The exception:
Xamarin.Forms.Xaml.XamlParseException: Position 11:14. Type but not found in xmlns http://xamarin.com/schemas/2014/forms occurred
Help please

Answer 1

There is no such type but...
Replace TargetType ="but" with TargetType="Button", and everything should work fine.
And BTW, looking at your code, it's a good habit to adopt strict naming rules, in this way you don't mix out lower/upper casing or key names. I say this because the key of your color is pascal-case, while the button's is in lower-case.
You should also use more specific keys, not just button, but I believe this was just for the example.