Angular Material Sidenav锁定始终在左侧打开

Question

我正在尝试使用角度材料，如下所示

1) Have it positioned on the right  
2) When opened its locked until a close button is pressed 
3) Doesn't close when you click away from menu 
4) When open its positioned on right

问题是，当您指定md-is-locked-open时，它始终在右侧打开？

https://material.angularjs.org/latest/demo/sidenav

<md-sidenav class="md-sidenav-right md-whiteframe-4dp" md-component-id="right" md-is-locked-open="vm.isOpen('right')">

vm.isOpen = function(navID){
    if(navID){
        return $mdSidenav(navID).isOpen();
    }
};

有什么想法吗？