void addElement (@Nonnull final PLElementWithSize aElement)
  {
    ValueEnforcer.notNull (aElement, "Element");
    m_aContentHeight.add (aElement);
  }
void addElement ( @ Nonnull final PLElementWithSize aElement ) { ValueEnforcer . notNull ( aElement , "Element" ) ; m_aContentHeight . add ( aElement ) ; }
@param aElement
The element to be added. May not be <code>null</code>. The element
height must be without padding or margin.