Problem with transform Matrix

programming flash
1

Dear all,

I need your help to solve this little problem.

I am adding movie clips from the library to a “container” which I scroll in both direction, x-y, like a tile based game. As part of the process I change the transform matrix of some of the mc in order to rotate o skew them.

The problem is those I change the matrix shake or tremble when a scroll the container.

If I set cacheAsBitmap = true the problem disappears but a new one arrives. The division between mc some times is not perfect and it is visible.

Do you have an idea how I can avoid this problem?.

Thanks in advance

Edit:
This is the code I use before to move the container:

var classRef:Class = getDefinitionByName(nameMC) as Class;
var instance:Object = new classRef();
var myMatrix:Matrix = new Matrix();
myMatrix.tx =  myTx;
myMatrix.ty = myTy;
myMatrix.a = myA;
myMatrix.b = myB;
myMatrix.c = myC;
myMatrix.d = myD;
instance.transform.matrix = myMatrix;
this.container.addChildAt(DisplayObject(instance),depthMC);