Button with explicitly declared Background Brush
<Window x:Class="WpfApplication1.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="" Height="300" Width="300"> <StackPanel Margin="10 10 10 10"> <Button Width="350" Height="30" Content="Button with explicitly declared Background Brush"> <Button.Background> <SolidColorBrush Color="Red" /> </Button.Background> </Button> </StackPanel> </Window>