Get rid of HorizontalLayout in MapOutputTab and use manual resizing. The OpenLayers Map widget is now resized and positioned manually by a ResizeHandler method. The automatic HorizontalLayout was obviously broken in combination with the OpenLayers widget. This should fix various layout issues with the OpenLayers Map.

select.abflusstafel = SELECT ABFLUSSTAFEL_NR, \
                             ABFLUSSTAFEL_BEZ, \
                             GUELTIG_VON, \
                             GUELTIG_BIS, \
                             PEGELNULLPUNKT FROM ABFLUSSTAFEL WHERE MESSSTELLE_NR LIKE :number