Sprite problems

I cant seem to get my sprites to display at all. I'm creating a sprite inside a scriptobject, at first i thought that was the problem but I added a bit at the start to just display a sprite as a test, it doesnt even display that.

new ScriptObject(Infant)
{
   postion = "0 0";
   size = 10;
   speed = 5;
   name = "NULL";
   type = "infant";
   state = "idle";
   imageMap = "InfantImageMap";
   sprite = "NULL";
};

function infant::onAdd(%this)
{
   echo("Infant " @ %this.name @ " created");
   echo("State = " @ %this.state);
   
   //create a sprite to go along with this
   %this.sprite = new t2dStaticSprite() {scenegraph = t2dSceneGraph;};
   %this.sprite.setsize("20 20");
   %this.sprite.setPosition("0 0");
   %this.sprite.setImageMap(ForestMossImageMap);
   %this.sprite.dump();
   
   %this.controller(%this);
}

btw, the dump call in there works so it seems like it might be getting created then destroyed.

This is what i added at the start to test things out

%sprite = new t2dStaticSprite() {scenegraph = t2dSceneGraph;};
%sprite.setsize("20 20");
%sprite.setPosition("0 0");
%sprite.setImageMap(ForestMossImageMap);

I get the feeling i'm missing something really basic and obvious here :S