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How can i set value of style with ConfigurationFile?
<applicationSettings>
    <TestApp.Properties.Settings>
        <setting name="ButtonBackground" serializeAs="String">
            <value>#FF008000</value>
        </setting>
    </TestApp.Properties.Settings>
</applicationSettings>

<Application x:Class="TestApp.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:p="clr-namespace:TestApp.Properties"
             StartupUri="MainWindow.xaml">
    <Application.Resources>
        <Style TargetType="Button">
            <Setter Property="Background" Value="{Binding Source={x:Static p:Settings.Default}, Path=ButtonBackground}"/>
        </Style>
    </Application.Resources>
</Application>