<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <Style x:Key="DefaultCheckBox" TargetType="{x:Type CheckBox}" BasedOn="{StaticResource MetroCheckBox}">
        <Setter Property="BorderBrush" Value="{DynamicResource GrayBrush8}" />
    </Style>

    <Style TargetType="{x:Type CheckBox}" BasedOn="{StaticResource DefaultCheckBox}" />
</ResourceDictionary>