Open picker programatically is not working

I tried to open the picker programatically, but its not working as expected. I used below code to open the picker

`this.$refs.picker.togglePicker(true)`

But if I wrap the code within the setTimeout function its working fine and the pickers opens.

```
setTimout(() => {
    this.$refs.picker.togglePicker(true)
}, 100);
```

Is there any reason for that?