///--------------------------------------------------------------------
/// <summary>
/// Gets the current property values from target.
/// </summary>
/// <param name="gridItemPattern">
/// A GridItemPattern control pattern obtained from 
/// an automation element representing a target control.
/// </param>
/// <param name="automationProperty">
/// The automation property of interest.
/// </param>
/// <returns>
/// An integer object representing the requested property value.
/// </returns>
///--------------------------------------------------------------------
private object GetGridItemProperties(
    GridItemPattern gridItemPattern,
    AutomationProperty automationProperty)
{
    if (automationProperty.Id ==
        GridItemPattern.ColumnProperty.Id)
    {
        return gridItemPattern.Current.Column;
    }
    if (automationProperty.Id ==
        GridItemPattern.RowProperty.Id)
    {
        return gridItemPattern.Current.Row;
    }
    if (automationProperty.Id ==
        GridItemPattern.ColumnSpanProperty.Id)
    {
        return gridItemPattern.Current.ColumnSpan;
    }
    if (automationProperty.Id ==
        GridItemPattern.RowSpanProperty.Id)
    {
        return gridItemPattern.Current.RowSpan;
    }

    return null;
}