<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="" Height="100" Width="300">
<Window.Resources>
<Style TargetType="{x:Type TextBox}">
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Background" Value="Orange" />
</Trigger>
<Trigger Property="IsFocused" Value="True" >
<Setter Property="Background" Value="Orange" />
</Trigger>
</Style.Triggers>
</Style>
</Window.Resources>
<Grid>
<TextBox Height="20" Width="200">
this is a test
</TextBox>
</Grid>
</Window>
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