Q:

CCTMXTiledMap not being added to layer

I have a working tilemap that I am able to add to my 'HelloWorldLayer' with the 'addChild' method. I am trying to add several layers at time intervals by calling a class I wrote through the game timer.
I execute the following code, but I can't see the tilemap added to the layer. ('tileMapNode' is set up in my .h file).
    tileMapNode = [CCTMXTiledMap tiledMapWithTMXFile:@"scroller.tmx"];
    tileMapNode.anchorPoint = ccp(pos.x, pos.y);

    [layer addChild:tileMapNode]

the 'layer' parameter references the 'HelloWorldLayer'. 
What am I doing wrong? If I add a sprite from this class to the HelloWorldLayer it works?

A:

The range of anchorPoint is between 0 and 1. By setting it to some position I suspect it's way out of range. Also very large tilemaps ( >16k tiles) won't render all tiles.

