/// <summary>
/// returns true if this Element and all parent Elements are visible
/// </summary>
/// <returns><c>true</c>, if parents visible was ared, <c>false</c> otherwise.</returns>
bool AreParentsVisible()
{
if (!_visible)
{
return(false);
}
if (parent != null)
{
return(parent.AreParentsVisible());
}
return(_visible);
}
