thePrs = new HYDROGUI_VTKPrsBathymetry( aBathymetry );
HYDROGUI_VTKPrsBathymetry* aPrsBathymetry = (HYDROGUI_VTKPrsBathymetry*)thePrs;
thePrs = new HYDROGUI_VTKPrsBathymetry( aBathymetry );
HYDROGUI_VTKPrsBathymetry* aPrsBathymetry = (HYDROGUI_VTKPrsBathymetry*)thePrs;