Hi, 
I have been stuck in this specific task. What I want to do is in the existing rental schedule gantt view along with day/week/month/year filter I want to add a new custom date range filter like From - To and based on that dates I want to show the rental orders. I understand that the existing view is coming from web_gantt module. I tried inheriting the module and try to add new filter. But, it doesn't work properly. Does any one have any idea about doing this task ?
Thanks in advance.