// Called when the gem should setup.
void ExpandingDropsGem::OnSetup(IDrawablePtr mainLayer)
{
    // Create a layer so we can dim this a little
    DrawablePtr dimmedLayer = std::make_shared<Drawable>();
    dimmedLayer->SetIntensity(0.3);
    m_mainLayer = dimmedLayer;

    // Add the layer
    mainLayer->AddDrawable(dimmedLayer, 50);
}