* described.
*/
public int getVerticalBlockIncrement( final Dimension aViewDimensions, final Rectangle aVisibleRect,
final int aDirection )
{
final SignalElementMeasurer measurer = SignalElementMeasurer.LOOSE_MEASURER;
final SignalElementManager elemMgr = getSignalElementManager();
IUIElement[] signalElements = elemMgr.getUIElements( aVisibleRect.y + 1, 1, measurer );
if ( signalElements.length == 0 )
{