src/vs/workbench/browser/parts/paneCompositePart.ts/PaneCompositeParts/openPaneComposite
class PaneCompositeParts:	openPaneComposite(id: string | undefined, viewContainerLocation: ViewContainerLocation, focus?: boolean): Promise<IPaneComposite | undefined> {
		return this.getPartByLocation(viewContainerLocation).openPaneComposite(id, focus);
	}