Units and Buildings being selected

function GuiRTSTSCtrl::updateDragSelect(%this, %obj)
{
   if(isObject(%obj))
      switch$(%obj.getClassName())
      {
         case "RTSUnit":
            %this.dragSelectObject(%obj);
         //case "RTSBuilding":                         < -- comment out this
         //   %this.addToSelection(%obj);       < -- two lines
         case "RTSBuilding":                               // and add 
            %this.dragSelectObject(%obj);         // this two
      }
}