Why AlivePDF generate double header?

I'm trying to generate a simple table with alivePDF. This is my code:

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
                                        xmlns:mh="mh.components.*"
                                        layout="absolute" width="500" height="500">
  
  
          <mx:Script>
                    <![CDATA[
                              import mx.collections.ArrayCollection;
  
                              import org.alivepdf.colors.RGBColor;
                              import org.alivepdf.display.Display;
                              import org.alivepdf.drawing.Caps;
                              import org.alivepdf.fonts.FontFamily;
                              import org.alivepdf.fonts.Style;
                              import org.alivepdf.grid.Grid;
                              import org.alivepdf.images.ImageFormat;
                              import org.alivepdf.layout.Orientation;
                              import org.alivepdf.layout.Resize;
                              import org.alivepdf.layout.Size;
                              import org.alivepdf.layout.Unit;
                              import org.alivepdf.pages.Page;
                              import org.alivepdf.pdf.PDF;
                              import org.alivepdf.saving.Method;
                              import org.alivepdf.visibility.Visibility;
  
                              import org.alivepdf.grid.*;
                              import mx.utils.ObjectUtil;
  
                              private var myPDF:PDF;
  
 protected function savePDF(e:MouseEvent):void
                              {
                                        var myPDF:PDF = new PDF ( Orientation.PORTRAIT, Unit.MM);
                                        myPDF.setDisplayMode(Display.FULL_PAGE);
                                        myPDF.addPage();
                                         
                                        var dp:ArrayCollection = new ArrayCollection();
                                        dp.addItem( { firstName : "Bob", lastName : "Groove", city : "Paris" } );
                                        dp.addItem( { firstName : "Bob", lastName : "Wise", city : "Paris" } );
                                        dp.addItem( { firstName : "Bob", lastName : "Wise", city : "Paris" } );
                                        dp.addItem( { firstName : "Bob", lastName : "Wise", city : "Paris" } );
  
                                        myPDF.textStyle ( new RGBColor ( 0x0EEFF0 ) );
                                        trace(ObjectUtil.toString(dp));
                                        var grid:Grid = new Grid ( dp.toArray(), 200, 100, new RGBColor (0x000000),null,false,null,null,0,12,6,"0j");
   
                                        myPDF.addGrid( grid, 5, 5);
                                        myPDF.save( Method.REMOTE, "coldfusion/pdf.cfm", "inline", "test.pdf" );
  
                              }
  
  
  
  
                    ]]>
          </mx:Script> 
  
          <mx:VBox width="100%" height="100%">
  
  
                    <mx:HBox width="100%" backgroundColor="#FFFFFF">
                              <mx:Spacer width="100%"/>
  
                              <mx:Button horizontalCenter="0" label="SavePDF" height="22"  click="savePDF(event)"  id="savePDFBtn" toolTip="SAVE TO PDF"/>
  
                    </mx:HBox>
          </mx:VBox>
  
  
</mx:Application>

The problem is that this generate a double header and I don't know why. You can see a live example here: http://docs.google.com/viewer?url=http://prestitiinpdap.biz/pdf/myPDF.pdf

Could you help me solve this error?

Thanks