Pls dont award before discussing
With due respect of your concern regarding your requirement I want to start with the answer of your first question that yes I am aware about the Vtiger. This is truth that I am not a daily user of Vtiger but still I have some minimum knowledge of Vtiger. This actually a CRM application and supports the below features:
Sales automation (customizable product entries, inventory management, quotations, billing, and trouble ticketing)
Customer support & service functions, including a customer self-service portal
Marketing automation (lead generation, campaign support, knowledge bases)
Inventory Management
Analysis and reporting
Now, the thing is that you want to use the telerik control to accomplish your requirement and I want to inform you that I can help you to make your application much more user friendly as I have the prior experience to work with Telerik Control, I am ready from my end to show you the demo of my work. Nonetheless I want to work in your application as if it's my own application.
Now, I have some minor question regarding your requirement:
1. Can you please specify that do you have already ready database or anything else as a data source to bind the Chat control? Can user change the data source according to his need?
2. Do you want to set the parameter dynamic for chart axis?
3. Is there will be any limit that user can paste maximum 10 widgets or something like this?
4. Do you want drag and drop functionality for the widget?