FlxBar not appearing in FlxSpriteGroup

[JustGabe]

I dunno what could be the problem, here's the whole code:

package;

import flixel.group.FlxSpriteGroup;

import flixel.text.FlxText;

import flixel.ui.FlxBar;

class HUD extends FlxSpriteGroup

{

private var healthDisplay:FlxText;

private var levelDisplay:FlxText;

private var expBar:FlxBar;

private var HP:Int;

private var maxHP:Int;

private var exp:Int;

private var maxExp:Int;

private var level:Int;

public function new() 

{

super();

scrollFactor.x = 0;

scrollFactor.y = 0;

healthDisplay = new FlxText(2, 2);

HP = 5;

maxHP = 10;

add(healthDisplay);

levelDisplay = new FlxText(2, 12);

level = 1;

add(levelDisplay);

exp = 3;

maxExp = 10;

expBar = new FlxBar(4, 25, FlxBarFillDirection.LEFT_TO_RIGHT, 100, 4, exp, "", 0, maxExp);

expBar.createFilledBar(0xFF63460C, 0xFFE6AA2F);

add(expBar);

}

override public function update(elapsed:Float):Void

{

super.update(elapsed);

healthDisplay.text = "Health: " + HP + "/" + maxHP;

levelDisplay.text = "Level: " + level;

expBar.value = exp;

}

public function addHealth(num:Int):Void

{

HP += num;

if (HP > maxHP)

HP = maxHP;

}

}

and the end result (no FlxBar to be seen):

[Gama11]

The FlxBar constructor call should look like this:

expBar = new FlxBar(4, 25, FlxBarFillDirection.LEFT_TO_RIGHT, 100, 4, this, "exp", 0, maxExp);

[JustGabe]

Still not showing for some reason :/

However, if I write it directly in the PlayState it does appear, but I want it to be shown as part of the HUD class.

[JustGabe]

Another weird thing happens: no FlxSprite appears if they're added :/

package;

import flixel.FlxSprite;

import flixel.group.FlxSpriteGroup;

import flixel.util.FlxColor;

class GUI extends FlxSpriteGroup

{

private var square:FlxSprite;

public function new() 

{

super();

square = new FlxSprite(10, 10);

square.makeGraphic(30, 30, FlxColor.BLUE);

add(square);

}

}

and in the main class the variable is correctly written:

private var statusGUI:GUI = new GUI();

(in create): add(statusGUI);

and they're the last item added... but if I add text in that class it does show.