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Ai SupartiniAi Supartini 

Missing Preview button for Lightning components/apps

Hi All,

I just started with 'Lightning Componenets' module in Trailhead.  I head created myDomain successfully.  
Now I am creating  HelloWorld component and application using Developer Console.  I found out that there is no Preview button. So, I can't preview the script.  
I tried to open other scripts (Visualforce pages and Classes), the Preview button is there.  Only for Lightning component and Lightning application, the Preview button is disappear.

Did I miss some step(s) ? 

Thanks you for helping me 
Ai