after zoom in/out to open callout is wrong position

dear all

 

after zoom in/out screen , open callout.

i'm having problems position

code:

 

    <fx:declarations>   

          <s:callout   id="bcallout"

                  mousedownoutside="bcallout.close()"

                  mouseup="bcallout.close()"

                  backgroundcolor="0x999999"

                  contentbackgroundalpha="0"/>

   </fx:declarations>

  <fx:script>

     private function zoom_action(act:string):void {

               var z:number;

                if(act=='+'){

                      z=0.25;

                }else{

                       z=-0.25;

                }

                var my_matrix:matrix = new matrix();

                my_matrix.scale(gr1.scalex+z, gr1.scalex+z);

                gr1.transform.matrix=my_matrix;

      }

   </fx:script>

 

  <s:group id="gr1">

          <s:button id="btn1"  x="24" y="50" label="btna" click="bcallout.open(btn1)"/>

          <s:button id="btn2"  x="100" y="100" label="btnb" click="bcallout.open(btn2)"/>

           <s:button id="btn3"  x="170" y="150" label="btnc" click="bcallout.open(btn3)"/>

  </s:group>

 

  <s:button id="zoomin" y="10" right="108" width="44" height="42" label="+" alpha="0.5"

                                click="zoom_action('+')"/>

  <s:button id="zoomout" y="10" right="59" width="44" height="42" label="-" alpha="0.5"

                                click="zoom_action('-')"/>

 

any ideas i'm doing wrong?

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