Can't get gotoAndStop(); to work

I have a fla file with a movieclip that has two frames. I try to change the movieclips frame by gotoAndStop through the as file but it doesn’t work. No error it just doesn’t do anything.

fla file code on first(only one frame)

import com.mygame.dodge.Dodge;
var classDodge:Dodge = new Dodge();
addChild(classDodge);

as code



	public class Dodge extends MovieClip
	{
		private var mcBob:Bob;
		private var mcStartButton:StartButton;


		static const mcBobDX = 200;
		//stride var
		private var makeStride:uint = 1;
		//used to move char
		private var leftArrow:Boolean = false;
		private var rightArrow:Boolean = false;
		private var upArrow:Boolean = false;
		private var bottomArrow:Boolean = false;
		
		


		public var lastTime:int;


		private var mcBobX:Number = 263;
		private var mcBobY:Number = 199;
		
		var myTimer:Timer = new Timer(1000,0);








		public function Dodge()
		{
			mcStartButton = new StartButton  ;
			mcStartButton.x = 152;
			mcStartButton.y = 164;
			
			
			addChild(mcStartButton);
			mcStartButton.addEventListener(MouseEvent.CLICK, startGame);
			myTimer.addEventListener(TimerEvent.TIMER, differentStrides);
		        myTimer.start();
			mcBob = new Bob();
			MovieClip(mcStartButton).gotoAndStop(2);
			mcBob.x = mcBobX;
			mcBob.y = mcBobY;
			




		}
		//start game
		public function startGame(event:MouseEvent):void
		{
			//deleting and switching
			removeChild(mcStartButton);
			mcStartButton.removeEventListener(MouseEvent.CLICK, startGame);
			mcBob = new Bob();
			MovieClip(mcBob).gotoAndStop(2);
			mcBob.x = mcBobX;
			mcBob.y = mcBobY;
			addChild(mcBob);
			stage.addEventListener(KeyboardEvent.KEY_DOWN, keyDown);
			stage.addEventListener(KeyboardEvent.KEY_UP, keyUp);
			addEventListener(Event.ENTER_FRAME, bobAnimation);
			lastTime = getTimer();
			
		    


		}
		//Animation
		private function bobAnimation(event:Event):void
		{


			var timePassed:int = getTimer() - lastTime;
			lastTime +=  timePassed;
			//check boundries////////////
			////////////////////////////////////
			if (leftArrow == true)
			{


				if (mcBob.x < 18)
				{
					leftArrow = false;
					mcBob.x = 23;
				}
			}
			if (rightArrow == true)
			{
				if (mcBob.x > 530)
				{
					rightArrow = false;
					mcBob.x = 530;


				}
			}
			if (upArrow == true)
			{
				if (mcBob.y < 15)
				{
					upArrow = false;
					mcBob.y = 13;
				}
			}
			if (bottomArrow == true)
			{
				if (mcBob.y > 381)
				{
					bottomArrow = false;
					mcBob.y = 381;
				}
			}






			///move object
			if (leftArrow == true)
			{
				mcBobX += (mcBobDX*timePassed/1000)*-1;




			}
			if (rightArrow == true)
			{
				mcBobX += (mcBobDX*timePassed/1000);






			}


			if (upArrow == true)
			{
				mcBobY += (mcBobDX*timePassed/1000)*-1;




			}
			if (bottomArrow == true)
			{
				mcBobY += (mcBobDX*timePassed/1000);




			}


			mcBob.x = mcBobX;
			mcBob.y = mcBobY;


			/////rotate char
			if (upArrow == true)
			{
				mcBob.rotation = 0;
			}
			if (bottomArrow == true)
			{
				mcBob.rotation = 180;
			}






			if (leftArrow == true)
			{
				if (upArrow == true)
				{
					mcBob.rotation = 315;
				}
				else if (bottomArrow == true)
				{
					mcBob.rotation = 225;
				}
				else
				{
					mcBob.rotation = 270;
				}
			}
			if (rightArrow == true)
			{
				if (upArrow == true)
				{
					mcBob.rotation = 45;
				}
				else if (bottomArrow == true)
				{
					mcBob.rotation = 135;
				}
				else
				{
					mcBob.rotation = 90;
				}
			}


















		}






	






	function differentStrides(e:TimerEvent):void
	{
		if (leftArrow == true || rightArrow == true || upArrow == true || bottomArrow == true)
		{


			makeStride++;


			if (makeStride == 3)
			{
			makeStride = 1;
			}


			MovieClip(mcBob).gotoAndStop(makeStride);
			trace(makeStride);
		}
	}








		function keyDown(event:KeyboardEvent):void
		{
			if (event.keyCode == 37)
			{
				leftArrow = true;








			}
			else if (event.keyCode == 39)
			{
				rightArrow = true;


			}
			else if (event.keyCode == 38)
			{
				upArrow = true;


			}
			else if (event.keyCode == 40)
			{
				bottomArrow = true;


			}
		}








		function keyUp(event:KeyboardEvent):void
		{
			if (event.keyCode == 37)
			{
				leftArrow = false;




			}
			else if (event.keyCode == 39)
			{
				rightArrow = false;
			}
			else if (event.keyCode == 38)
			{
				upArrow = false;
			}
			else if (event.keyCode == 40)
			{
				bottomArrow = false;
			}
		}








	}




}

I put this into the constructor function and when the program adds the child its frame doesn’t come out to what I want it to.

MovieClip(mcStartButton).gotoAndStop(2);

Thanks.