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

[RM12]

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

[VladimirN]

Related topic: https://community.ptc.com/t5/ThingWorx-Developers/How-to-create-gantt-range-chart-in-Thingworx/td-p/574031

Article - "Support for a "Gantt Chart" type visualization in ThingWorx": https://www.ptc.com/en/support/article/CS236248

[RM12]

Thanks for your reply, I already check this both links. Is their any other solution for the same? 

Is Any Custom Gantt Widget Extension done by anyone that would be a great help as I am new to extension development.