WPF, style for buttons in XAML

Basically these controls are created with styles (Styles) and attached properties (Attached Properties), sometimes you can also use triggers (Triggers) with the XAML language.

For example, you can create a button in the following way, using a resource file or in the same XAML of your page:

<ResourceDictionary
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:botoncito="clr-namespace:MiProyecto.PropiedadesBoton">
    ...
    <Style x:Key="Imagen1" TargetType="Button">
        <Setter Property="ContentTemplate">
            <Setter.Value>
                <DataTemplate>
                    <StackPanel Orientation="Horizontal">
                        <Image Source="{Binding Path=(botoncito:ButtonProperties.Image), RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Button}}}"></Image>
                        <ContentPresenter Content="{Binding Path=Content, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Button}}}"></ContentPresenter>
                    </StackPanel>
                </DataTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</ResourceDictionary>

We define the attached properties (Attached Properties) by means of code C #:

public class PropiedadesBoton
{
    public static ImageSource GetImage(DependencyObject obj)
    {
        return (ImageSource)obj.GetValue(ImageProperty);
    }

    public static void SetImage(DependencyObject obj, ImageSource value)
    {
        obj.SetValue(ImageProperty, value);
    }

    public static readonly DependencyProperty ImageProperty =
        DependencyProperty.RegisterAttached("Image", typeof(ImageSource), typeof(PropiedadesBoton), new UIPropertyMetadata((ImageSource)null));
}

Finally, in your XAML file, where you will use the button itself, you can place the following code:

<Button Style="{StaticResource Imagen1}" botoncito:ButtonProperties.Image="{StaticResource MyImage}" Content="Test">
</Button>

The tutorial provided by MSDN is quite interesting and complete to learn how to perform this task. Almost all WPF controls can be customized.