Only create the GaugeTree and RiverInfoPanel once This fixes resizing issues when changing the river. SmartGWT is not able to recalculate the height and width if a GWT widget is inserted later. Every attempt to call a recalculation manually did fail. Fix for flys/issue925 (W-INFO / Pegel-Info-Modul / Zeile Gewässer-INFOS)

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