Not wanted zooming out

[Artur Skalski]

Hi List

I'm using mapserver 44, with php mapscript, and I've got some problem
zooming.
In my application I've added an option to add point dynamicaly, the code
looks like this:

else if ($HTTP_FORM_VARS["CMD"] == "ADD_POINT")
     {

  $nClickGeoX = GMapPix2Geo($nClickPixX, 0, $dfWidthPix,
           $dfMinX, $dfMaxX, 0);
  $nClickGeoY = GMapPix2Geo($nClickPixY, 0, $dfHeightPix,
           $dfMinY, $dfMaxY, 1);
$spoint = ms_newPointObj();
      $spoint->setXY($nClickGeoX, $nClickGeoY);

  $slayer = $gpoMap->getLayerByName(selpoint);

  $sline = ms_newLineObj();
      $sline->add($spoint);

  $sshape = ms_newShapeObj(MS_SHAPE_POINT);
      $sshape->add($sline);

  $slayer->addFeature($sshape);

adding works wery well but I've got some unexpected behaviour which is that
after adding a point maps zooms out itself to the max extent, why?

the part of mapfile for this layer looks like this:

LAYER
    NAME selpoint
    TYPE POINT
    STATUS ON
   CLASS
       NAME "0"
       STYLE
         COLOR 0 0 180
          SYMBOL 'C:\Inetpub\wwwroot\mapserver\sopot\etc\tutaj.gif'
       END
   END
END

Do you have any idea why is this happening, and how can i avoide it?

regards

Artur