Drawing on top of inventory screens

Hi there.

I would like to draw on top of inventory screens, however I have one issue. Items in inventories draw above my overlay.

Here, I'm darkening the screen (Eventually, I plan to draw useful stuff on top of the inventory GUI, rather than just darkening the screen, so please don't tell me to not bother darkening it). Notice how the chest draws on top of my overlay.

I hook into

RenderTickEvent

to draw on top of inventories

    @SubscribeEvent
    public void tickEvent(TickEvent.RenderTickEvent e) {
        if (e.phase == TickEvent.Phase.END) {
            UIUtils.calcStuff();
            drawOverlay();
        }
    }

    public void drawOverlay() {
        Minecraft mc = Minecraft.getMinecraft();

        if (mc.currentScreen instanceof GuiContainer) { //A container GUI is open
            drawContainerOverlay(mc, (GuiContainer) mc.currentScreen); //This draws the overlay
        }
    }