Howto Change Generic Xaml Style Property in Runtime

Question

When you write a xaml anonymus style( without key) in App.xaml resources, it applies to all TargetTypes in application.

i.e:

<Style TargetType="SplitView">
    <Setter Property="OpenPaneLength" Value="110"/>
</Style>

Makes all SplitView's OpenPaneLength to 110.
Are there any ways to change a property of anonymous style in runtime programatically.