src/vs/workbench/browser/parts/compositeBar.ts/CompositeBarModel/activate
class CompositeBarModel:	activate(id: string): boolean {
		if (!this.activeItem || this.activeItem.id !== id) {
			if (this.activeItem) {
				this.deactivate();
			}
			for (const item of this.items) {
				if (item.id === id) {
					this.activeItem = item;
					this.activeItem.activityAction.activate();
					return true;
				}
			}
		}
		return false;
	}