ScrollPattern.HorizontallyScrollableProperty Field

///-------------------------------------------------------------------- 
/// <summary> 
/// Finds all automation elements that satisfy  
/// the specified condition(s). 
/// </summary> 
/// <param name="targetApp">
/// The automation element from which to start searching. 
/// </param> 
/// <returns> 
/// A collection of automation elements satisfying  
/// the specified condition(s). 
/// </returns> 
///-------------------------------------------------------------------- 
private AutomationElementCollection FindAutomationElement(
    AutomationElement targetApp)
{
    if (targetApp == null)
    {
        throw new ArgumentException("Root element cannot be null.");
    }

    PropertyCondition conditionSupportsScroll =
        new PropertyCondition(
        AutomationElement.IsScrollPatternAvailableProperty, true);

    PropertyCondition conditionHorizontallyScrollable =
        new PropertyCondition(
        ScrollPattern.HorizontallyScrollableProperty, true);

    PropertyCondition conditionVerticallyScrollable =
        new PropertyCondition(
        ScrollPattern.VerticallyScrollableProperty, true);

    // Use any combination of the preceding conditions to  
    // find the control(s) of interest
    Condition condition = new AndCondition(
        conditionSupportsScroll,
        conditionHorizontallyScrollable, 
        conditionVerticallyScrollable);

    return targetApp.FindAll(TreeScope.Descendants, condition); 
}