Use the Mouse Wheel action methods that are defined by the IScrollInfo interface

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<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    x:Class="ScrollViewer_Methods.Window1"
    Title="ScrollViewer IScrollInfo Sample"
    Loaded="onLoad">
<DockPanel>
<TextBlock DockPanel.Dock="Top" FontSize="20" FontWeight="Bold" Margin="10">IScrollInfo Interface Methods</TextBlock>
<StackPanel DockPanel.Dock="Left" Width="150">
    <Button Click="spMouseWheelDown">MouseWheelDown</Button>
    <Button Click="spMouseWheelUp">MouseWheelUp</Button>
    <Button Click="spMouseWheelLeft">MouseWheelLeft</Button>
    <Button Click="spMouseWheelRight">MouseWheelRight</Button>
</StackPanel>  
<Border BorderBrush="Black" Background="White" BorderThickness="2" Width="500" Height="500">
    <ScrollViewer Name="sv1" CanContentScroll="True" VerticalScrollBarVisibility="Visible" HorizontalScrollBarVisibility="Visible">
        <StackPanel Name="sp1">
            <Button>Button 1</Button>
            <Button>Button 5</Button>
            <Rectangle Width="700" Height="500" Fill="Green"/>
            <TextBlock>Rectangle 3</TextBlock>
        </StackPanel> 
    </ScrollViewer>
</Border>
</DockPanel>
</Window>
//File:Window.xaml.cs

using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using System.Windows.Documents;
using System.Windows.Navigation;
using System.Text;

namespace ScrollViewer_Methods
{
    public partial class Window1 : Window
    {
        private void onLoad(object sender, System.EventArgs e)
        {
            ((IScrollInfo)sp1).CanVerticallyScroll = true;
            ((IScrollInfo)sp1).CanHorizontallyScroll = true;
            ((IScrollInfo)sp1).ScrollOwner = sv1;
        }
        private void spMouseWheelDown(object sender, RoutedEventArgs e)
        {
            ((IScrollInfo)sp1).MouseWheelDown();
        }
        private void spMouseWheelUp(object sender, RoutedEventArgs e)
        {
            ((IScrollInfo)sp1).MouseWheelUp();
        }
        private void spMouseWheelLeft(object sender, RoutedEventArgs e)
        {
            ((IScrollInfo)sp1).MouseWheelLeft();
        }
        private void spMouseWheelRight(object sender, RoutedEventArgs e)
        {
            ((IScrollInfo)sp1).MouseWheelRight();
        }
    }
}