Get Mouse Position in flex 4.5

 <?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.macromedia.com/2003/mxml" horizontalAlign="left" 
  mouseMove="onMouseMove(event)"
  mouseDown="onMouseDown(event)">
<mx:Script><![CDATA[
 //tests mousedown to see if it is over Web Access button
 private var giMouseXLast:Number = 0;
 private var giMouseYLast:Number = 0;
 private function onMouseDown(oEvent:Object):Void
 {
  var iMouseX:Number = oEvent.target.mouseX;
  var iMouseY:Number = oEvent.target.mouseY;
  if (iMouseX > 200 && iMouseX < 400 && iMouseY > 100 && iMouseY <200)  {   //mousedown is over magic spot
   alert("You hit the magic spot");
  }
  lblLastMouseDownCoord.text = "(" + iMouseX + "," + iMouseY + ")"
 }

 //sets global variables when mouse moves
 private function onMouseMove(oEvent:Object):Void
 {
  giMouseXLast = oEvent.target.mouseX;
  giMouseYLast = oEvent.target.mouseY;
 }
]]></mx:Script>
 <mx:HBox>
  <mx:Label id="lblLastMouseDown" text="Last Mouse Down"  color="#FFFFFF" fontSize="18" />
  <mx:Label id="lblLastMouseDownCoord" text="" color="#FFFFFF" fontSize="18" />
 </mx:HBox>

 <mx:HBox>
  <mx:Label id="lblCurMousePos" text="Current Mouse Position"  color="#FFFFFF" fontSize="18" />
  <mx:Label id="lblCurMousePosCoord"
    text='{"(" + giMouseXLast + "," + giMouseYLast + ")"}'
    color="#FFFFFF" fontSize="18" />
 </mx:HBox>

</mx:Application>

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Displaying icons in a Flex PopUpButton control

<?xml version="1.0"?>
<!-- http://blog.flexexamples.com/2008/01/24/displaying-icons-in-a-flex-popupbutton-control/ -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="horizontal"
        verticalAlign="top"
        backgroundColor="white">

    <mx:Script>
        <![CDATA[
            import mx.controls.Menu;

            [Bindable]
            private var menu:Menu;

            private function initMenu():void {
                menu = new Menu();
                menu.dataProvider = arr;
            }
        ]]>
    </mx:Script>

    <mx:Style>
        PopUpButton {
            popUpStyleName: myCustomPopUpStyleName;
        }

        .myCustomPopUpStyleName {
           fontWeight: normal;
           textAlign: left;
        }
    </mx:Style>

    <mx:Array id="arr">
        <mx:Object label="Alert" />
        <mx:Object label="Button"
                icon="@Embed('assets/Button.png')" />
        <mx:Object label="ButtonBar"
                icon="@Embed('assets/ButtonBar.png')" />
        <mx:Object label="CheckBox"
                icon="@Embed('assets/CheckBox.png')" />
        <mx:Object label="ColorPicker"
                icon="@Embed('assets/ColorPicker.png')" />
    </mx:Array>

    <mx:PopUpButton id="popUpButton"
            label="Select a control..."
            popUp="{menu}"
            preinitialize="initMenu();"
            creationComplete="popUpButton.open();" />

</mx:Application>