DependancyObjectExtensions.cs

/// <summary>
/// Extension methods for <see cref="DependencyObject"/>.
/// </summary>
public static class DependancyObjectExtensions
{
    /// <summary>
    /// Gets the visual parent of the specified type of the child.
    /// </summary>
    /// <typeparam name="T">The type.</typeparam>
    /// <param name="child">The child.</param>
    /// <returns>The parent with the specified type.</returns>
    public static T GetVisualParent<T>(this DependencyObject child) where T : DependencyObject
    {
        while (true)
        {
            DependencyObject parentObject = VisualTreeHelper.GetParent(child);

            if (parentObject == null)
            {
                return null;
            }

            if (parentObject is T)
            {
                return parentObject as T;
            }

            child = parentObject;
        }
    }
}