GeomPlate_Surface Bug !

Most recently I wrote some code that shall display an approximation of a cloud of points.

Here is the vital part of it, that causes severe problems compiling:

GeomPlate_BuildPlateSurface BPSurf(3,15,2);
...
Handle(GeomPlate_Surface) PSurf=BPSurf.Surface();
...
Standard_Real Umin, Umax, Vmin, Vmax;
PSurf.Bounds( Umin, Umax, Vmin, Vmax);
...

The compiler complaints:
... no matching function for call to `Handle_GeomPlate_Surface::Bounds (Standard_Real &, Standard_Real &, Standard_Real &, Standard_Real &)'

I have tried anything and all variants with or without Handle, Pointers...
like PSurf->Bounds( Umin, Umax, Vmin, Vmax);

The OCC 5.0 source-code of this suspect method says:
void GeomPlate_Surface::Bounds(Standard_Real& U1, Standard_Real& U2, Standard_Real& V1, Standard_Real& V2) const
{
if (mySurfinit->DynamicType() == STANDARD_TYPE(GeomPlate_Surface))
mySurfinit->Bounds(U1,U2,V1,V2);
else
{U1=myUmin;U2=myUmax;V1=myVmin;V2=myVmax;}
}

What to do now ? Is it a bug in OCC ???

Any hints and tricks are welcome !!!

MCV