Customize the timeline

I want to customize the timeline easily.
I would like to collaborate on highlighting only “some time”.

※ Should I make it from “ViewModel”? .
https://groups.google.com/forum/#!msg/cesium-dev/WF065mEMqCI/6RL2_ygTAgAJ

I would like advice.
Thank you.

Ver:1.58

Yeah I do think you would need to create your own widget to have full control over customizing this.