this.lineContainer = new Container();
this.addChild(this.lineContainer);
this.maskGfx = new Graphics();
this.maskGfx.beginFill(0x000000, 1);
this.maskGfx.drawRect(0, 0, ModelSlot.ASSETS_WIDTH, this.bgHeight);
this.maskGfx.endFill();
this.addChild(this.maskGfx);
this.lineContainer.mask = this.maskGfx;