Action script objects not displayed

Question

Hi,
I am creating an air application using Flex 4.5 compiler. The problem i am facing currently is that i have extended shape class to my custom class movingObject. in this class i have defined a function "drawcircleObj" in this class and calling this class function to display my customized circle on the stage.
But it is not behaving as desired. i.e. no object is being displayed

Answer 1

Adding my code snippets
The as file code
package secondPackage
    import flash.display.*;
    public class movingObject extends Shape
        private var xPos:Number;
        private var yPos:Number;
        private var radius:Number;
        private var color:uint;
        public function movingObject()
        {// currently a stub will use it later
        public function drawcircleObj(xInput:Number,
                                      yInput:Number,
                                      radInput:Number,
                                      colorInput:uint): void
            xPos = xInput;
            yPos = yInput;
            radius = radInput;
            color = colorInput ;
            this.graphics.beginFill(color);
            this.graphics.drawCircle(xPos,yPos,radius);
The mxml file code
<s:WindowedApplication xmlns:fx="http://ns.adobe.com/mxml/2009"
                       xmlns:s="library://ns.adobe.com/flex/spark"
                       xmlns:mx="library://ns.adobe.com/flex/mx"
                       creationComplete="initApp()">
    <fx:Script>
        <![CDATA[
            import secondPackage.movingObject;
            import flash.display.*;
            private var myMoving:movingObject = new movingObject();
            public function initApp():void
                //show the string
                myMoving.drawcircleObj(500,500,30,0xFF0000);
                mainText.text = myMoving.letsStart();
        ]]>
    </fx:Script>
    <s:TextArea id="mainText" x="390" width="50" y="133"/>
    <s:Button  id="button1" x="804" y="227" label="Button" width="45"/>
</s:WindowedApplication>
The problem which i suspect is that there should be a stage object holding the same object or circle created and then display it.
A faster reply will be highly appreciated. Thank you.