How can I access the material of a certain mesh of an ObjectContainer in an array., e.g. changing the material of cubeFront of Cubes[23]?

code attached.

(cubes[23] as Mesh).material = ......

Sorry, but this does not work.

I have found a code to replace this cube:
cubesContainer.addChild(imageCube2);
 
  imageCube2.position = cubesContainer.getChildAt(20).position;
  imageCube2.rotationY = cubesContainer.getChildAt(20).rotationY;
  imageCube2.rotationZ = cubesContainer.getChildAt(20).rotationZ;
  imageCube2.rotationX = cubesContainer.getChildAt(20).rotationX;
  cubesContainer.getChildAt(20).dispose();

but I do not know how simply replace just the material of the front plane.

Any idea?

And how do I make the faces mouseEnabled again?

I have found the solution:
Define the cube as Mesh.
And accessing the material via
Cubes[22].getChildAt(0).material = FrontTexture3;