Placing a new object

Hi,

I have created a new class called RTSBuilding, and it's parent is ShapeBase. I don't have anything unique about this class right now, just a class with only its constructor. I also created a RTSBuildingData class, and it's parent is ShapeBaseData. Again, there's nothing unique about this class. When I click the mouse button down, I want a object to be created of this class. So I thought this code would work:

datablock RTSBuildingData(blockBuilding)
{
   category = "Buildings";
   shapeFile = "~/data/shapes/buildings/blockBuilding.dts";
};

function serverCmdPlaceBuilding(%conn, %transform, %data)
{
   %building = new RTSBuilding()
   {
      datablock = %data;
      scale = "1 1 1";
   };
   %building.setTransform( %transform );

   MissionCleanup.add(%building);
}

The PlaceBuilding command gets called correctly and all that, but when I place it nothing happens. There aren't any errors or anything like that either. For some reason, if I have the parent of RTSBuilding be Player, and the parent of RTSBuildingData be PlayerData, the building is placed fine. Why is this?

Thanks