src/vs/workbench/browser/layout.ts/Layout/getContainer
class Layout:	getContainer(part: Parts): HTMLElement | undefined {
		switch (part) {
			case Parts.TITLEBAR_PART:
				return this.getPart(Parts.TITLEBAR_PART).getContainer();
			case Parts.BANNER_PART:
				return this.getPart(Parts.BANNER_PART).getContainer();
			case Parts.ACTIVITYBAR_PART:
				return this.getPart(Parts.ACTIVITYBAR_PART).getContainer();
			case Parts.SIDEBAR_PART:
				return this.getPart(Parts.SIDEBAR_PART).getContainer();
			case Parts.PANEL_PART:
				return this.getPart(Parts.PANEL_PART).getContainer();
			case Parts.EDITOR_PART:
				return this.getPart(Parts.EDITOR_PART).getContainer();
			case Parts.STATUSBAR_PART:
				return this.getPart(Parts.STATUSBAR_PART).getContainer();
		}
	}