Button的选中Effect，我们看下下面的效果：
让我们再放大一点：
怎么设置上面样式呢？直接设置Button的Effect，有点问题，因为Effect不是四周环绕的。那我们也只能重新定义Template了。下面看控件模板：
<ControlTemplate x:Key="LightedBtnTemplate" TargetType="RadioButton">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="5"></RowDefinition>
<RowDefinition></RowDefinition>
<RowDefinition Height="5"></RowDefinition>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="5"></ColumnDefinition>
<ColumnDefinition></ColumnDefinition>
<ColumnDefinition Width="5"></ColumnDefinition>
</Grid.ColumnDefinitions>
<Rectangle Grid.Row="1" Grid.Column="1" Fill="{TemplateBinding Background}"></Rectangle> <Grid x:Name="Grid_00" Grid.Row="0" Grid.Column="0"></Grid>
<Grid x:Name="Grid_02" Grid.Row="0" Grid.Column="2"></Grid>
<Grid x:Name="Grid_20" Grid.Row="2" Grid.Column="0"></Grid>
<Grid x:Name="Grid_22" Grid.Row="2" Grid.Column="2"></Grid>
<Grid x:Name="Grid_Top" Grid.Row="0" Grid.Column="1"></Grid>
<Grid x:Name="Grid_Bottom" Grid.Row="2" Grid.Column="1"></Grid>
<Grid x:Name="Grid_Left" Grid.Row="1" Grid.Column="0"></Grid>
<Grid x:Name="Grid_Right" Grid.Row="1" Grid.Column="2"></Grid>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="IsChecked" Value="True">
<Setter TargetName="Grid_00" Property="Background">
<Setter.Value>
<LinearGradientBrush StartPoint="1,1" EndPoint="0,0">
<GradientStop Color="White" Offset="0"></GradientStop>
<GradientStop Color="Transparent" Offset="0.5"></GradientStop>
</LinearGradientBrush>
</Setter.Value>
</Setter>
<Setter TargetName="Grid_02" Property="Background">
<Setter.Value>
<LinearGradientBrush StartPoint="0,1" EndPoint="1,0">
<GradientStop Color="White" Offset="0"></GradientStop>
<GradientStop Color="Transparent" Offset="0.5"></GradientStop>
</LinearGradientBrush> </Setter.Value>
</Setter>
<Setter TargetName="Grid_20" Property="Background">
<Setter.Value>
<LinearGradientBrush StartPoint="1,0" EndPoint="0,1">
<GradientStop Color="White" Offset="0"></GradientStop>
<GradientStop Color="Transparent" Offset="0.5"></GradientStop>
</LinearGradientBrush>
</Setter.Value>
</Setter>
<Setter TargetName="Grid_22" Property="Background">
<Setter.Value>
<LinearGradientBrush StartPoint="0,0" EndPoint="1,1">
<GradientStop Color="White" Offset="0"></GradientStop>
<GradientStop Color="Transparent" Offset="0.5"></GradientStop>
</LinearGradientBrush>
</Setter.Value>
</Setter>
<Setter TargetName="Grid_Top" Property="Background">
<Setter.Value>
<LinearGradientBrush StartPoint="1,1" EndPoint="1,0">
<GradientStop Color="White" Offset="0"></GradientStop>
<GradientStop Color="Transparent" Offset="1"></GradientStop>
</LinearGradientBrush>
</Setter.Value>
</Setter>
<Setter TargetName="Grid_Bottom" Property="Background">
<Setter.Value>
<LinearGradientBrush StartPoint="1,0" EndPoint="1,1">
<GradientStop Color="White" Offset="0"></GradientStop>
<GradientStop Color="Transparent" Offset="1"></GradientStop>
</LinearGradientBrush>
</Setter.Value>
</Setter>
<Setter TargetName="Grid_Left" Property="Background">
<Setter.Value>
<LinearGradientBrush StartPoint="1,1" EndPoint="0,1">
<GradientStop Color="White" Offset="0"></GradientStop>
<GradientStop Color="Transparent" Offset="1"></GradientStop>
</LinearGradientBrush>
</Setter.Value>
</Setter>
<Setter TargetName="Grid_Right" Property="Background">
<Setter.Value>
<LinearGradientBrush StartPoint="0,1" EndPoint="1,1">
<GradientStop Color="White" Offset="0"></GradientStop>
<GradientStop Color="Transparent" Offset="1"></GradientStop>
</LinearGradientBrush>
</Setter.Value>
</Setter>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
~~~估计你一下就能看懂了，只是用了点小技巧，多加了几个外部元素。
当然这个也是可以设置成自动的，然后在选中的时候，再加宽度和高度，这样就不会影响控件本身的布局。
下面是Demo：
<Window x:Class="WpfApplication13.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="200" Width="525" Background="LightBlue">
<Window.Resources>
<ControlTemplate x:Key="LightedBtnTemplate" TargetType="RadioButton">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="5"></RowDefinition>
<RowDefinition></RowDefinition>
<RowDefinition Height="5"></RowDefinition>
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="5"></ColumnDefinition>
<ColumnDefinition></ColumnDefinition>
<ColumnDefinition Width="5"></ColumnDefinition>
</Grid.ColumnDefinitions>
<Rectangle Grid.Row="1" Grid.Column="1" Fill="{TemplateBinding Background}"></Rectangle> <Grid x:Name="Grid_00" Grid.Row="0" Grid.Column="0"></Grid>
<Grid x:Name="Grid_02" Grid.Row="0" Grid.Column="2"></Grid>
<Grid x:Name="Grid_20" Grid.Row="2" Grid.Column="0"></Grid>
<Grid x:Name="Grid_22" Grid.Row="2" Grid.Column="2"></Grid>
<Grid x:Name="Grid_Top" Grid.Row="0" Grid.Column="1"></Grid>
<Grid x:Name="Grid_Bottom" Grid.Row="2" Grid.Column="1"></Grid>
<Grid x:Name="Grid_Left" Grid.Row="1" Grid.Column="0"></Grid>
<Grid x:Name="Grid_Right" Grid.Row="1" Grid.Column="2"></Grid>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="IsChecked" Value="True">
<Setter TargetName="Grid_00" Property="Background">
<Setter.Value>
<LinearGradientBrush StartPoint="1,1" EndPoint="0,0">
<GradientStop Color="White" Offset="0"></GradientStop>
<GradientStop Color="Transparent" Offset="0.5"></GradientStop>
</LinearGradientBrush>
</Setter.Value>
</Setter>
<Setter TargetName="Grid_02" Property="Background">
<Setter.Value>
<LinearGradientBrush StartPoint="0,1" EndPoint="1,0">
<GradientStop Color="White" Offset="0"></GradientStop>
<GradientStop Color="Transparent" Offset="0.5"></GradientStop>
</LinearGradientBrush> </Setter.Value>
</Setter>
<Setter TargetName="Grid_20" Property="Background">
<Setter.Value>
<LinearGradientBrush StartPoint="1,0" EndPoint="0,1">
<GradientStop Color="White" Offset="0"></GradientStop>
<GradientStop Color="Transparent" Offset="0.5"></GradientStop>
</LinearGradientBrush>
</Setter.Value>
</Setter>
<Setter TargetName="Grid_22" Property="Background">
<Setter.Value>
<LinearGradientBrush StartPoint="0,0" EndPoint="1,1">
<GradientStop Color="White" Offset="0"></GradientStop>
<GradientStop Color="Transparent" Offset="0.5"></GradientStop>
</LinearGradientBrush>
</Setter.Value>
</Setter>
<Setter TargetName="Grid_Top" Property="Background">
<Setter.Value>
<LinearGradientBrush StartPoint="1,1" EndPoint="1,0">
<GradientStop Color="White" Offset="0"></GradientStop>
<GradientStop Color="Transparent" Offset="1"></GradientStop>
</LinearGradientBrush>
</Setter.Value>
</Setter>
<Setter TargetName="Grid_Bottom" Property="Background">
<Setter.Value>
<LinearGradientBrush StartPoint="1,0" EndPoint="1,1">
<GradientStop Color="White" Offset="0"></GradientStop>
<GradientStop Color="Transparent" Offset="1"></GradientStop>
</LinearGradientBrush>
</Setter.Value>
</Setter>
<Setter TargetName="Grid_Left" Property="Background">
<Setter.Value>
<LinearGradientBrush StartPoint="1,1" EndPoint="0,1">
<GradientStop Color="White" Offset="0"></GradientStop>
<GradientStop Color="Transparent" Offset="1"></GradientStop>
</LinearGradientBrush>
</Setter.Value>
</Setter>
<Setter TargetName="Grid_Right" Property="Background">
<Setter.Value>
<LinearGradientBrush StartPoint="0,1" EndPoint="1,1">
<GradientStop Color="White" Offset="0"></GradientStop>
<GradientStop Color="Transparent" Offset="1"></GradientStop>
</LinearGradientBrush>
</Setter.Value>
</Setter>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Window.Resources>
<Grid>
<StackPanel Margin="0,5,0,-5">
<RadioButton Height="30" Width="100" Background="DeepSkyBlue" Template="{StaticResource LightedBtnTemplate}"></RadioButton>
<RadioButton Height="30" Width="100" Background="DeepSkyBlue" IsChecked="True" Template="{StaticResource LightedBtnTemplate}"></RadioButton>
<RadioButton Height="30" Width="100" Background="DeepSkyBlue" Template="{StaticResource LightedBtnTemplate}"></RadioButton>
</StackPanel>
</Grid>
</Window>