<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">

    <ResourceDictionary.MergedDictionaries>
        <ResourceDictionary Source="pack://application:,,,/Resources/StyleScrolllview.xaml" />
        <ResourceDictionary Source="pack://application:,,,/Resources/StyleButton.xaml" />
    </ResourceDictionary.MergedDictionaries>

    <Style BasedOn="{StaticResource for_scrollbar}" TargetType="ScrollBar" />
    <Style BasedOn="{StaticResource for_scrollviewer}" TargetType="ScrollViewer" />

    <Style BasedOn="{StaticResource MyButton}" TargetType="Button" />
</ResourceDictionary>