Cannot view Gantt chart widget after importing extension in Thingworx 9.2 ??

Hello.

        I want to display the data in Gantt chart. I refer this post  and I successfully import extension but the Gantt chart widget  is not visible in widget section. 

I'm using Thingworx 9.2 version . please check the below attachment and let me know ;

What is the solution for this? OR

Is there inbuild Gantt chart extension available which supports and works properly in Thingworx 9.2 then please let me know

Thanks in Advance