src/vs/workbench/contrib/scm/browser/menus.ts/SCMMenusItem/resourceGroupMenu
class SCMMenusItem:	get resourceGroupMenu(): IMenu {
		if (!this._resourceGroupMenu) {
			this._resourceGroupMenu = this.menuService.createMenu(MenuId.SCMResourceGroupContext, this.contextKeyService);
		}

		return this._resourceGroupMenu;
	}