http://projects.stroep.nl/flambe-patternsprite-issue/

Main.hx

package urgame;

import flambe.Component;
import flambe.Entity;
import flambe.System;
import flambe.asset.AssetPack;
import flambe.asset.Manifest;
import flambe.display.FillSprite;
import flambe.display.ImageSprite;
import flambe.animation.AnimatedFloat;
import flambe.display.Graphics;
import flambe.display.PatternSprite;
import flambe.display.Texture;
import urgame.Main.CustomPatternSpriteMover;

class Main
{
    private static function main ()
    {
        System.init();

        var manifest = Manifest.fromAssets("bootstrap");
        var loader = System.loadAssetPack(manifest).get(function onSuccess (pack :AssetPack)
		{
			System.root.addChild(new Entity()
				.add(new FillSprite(0x202020, System.stage.width, System.stage.height)));

			System.root.addChild(new Entity()
				.add(new CustomPatternSpriteMover(40.0, 0.0))
				.add(new CustomPatternSprite(pack.getTexture("pattern"))));
		});
    }
}

class CustomPatternSprite extends PatternSprite 
{
    public var left (default, null):AnimatedFloat;
    public var top (default, null):AnimatedFloat;

    public function new (texture:Texture, ?width:Float = -1, ?height:Float = -1)
    {
        super(texture, width, height);
        this.left = new AnimatedFloat(0);
        this.top = new AnimatedFloat(0);
    }

    override public function draw (g:Graphics)
    {
        if (texture != null) 
		{
            g.drawPattern(texture, left._ % width._, top._ % height._, width._, height._);
        }
    }
	
    override public function onUpdate (dt :Float)
    {
        super.onUpdate(dt);
		this.left.update(dt);
		this.top.update(dt);
    }
}

class CustomPatternSpriteMover extends Component 
{
	public var speedY:Float;
	public var speedX:Float;
	
	public function new(speedX:Float = 0, speedY:Float  = 0) 
	{
		this.speedY = speedY;
		this.speedX = speedX;
	}
	
	override public function onUpdate(dt:Float)
	{
		var sprite = owner.get(CustomPatternSprite);
		
		sprite.left._ += dt * speedX;
		sprite.top._ += dt * speedY;
	}
}