Thanks Samuel.. I tried custom action also. 

Custom action also can add controls underneath to title bar. but I want the icon in Title bar itself.

or if possible if I hover on Widget name, some tool tip about the widget can also help. 

Thanks  Evgeny Shvarov, the link you shared is very helpful.

But I could not use Angular for our product as now. We are embedding DeepSee dashboard in silverlight.

Can we use some custom appearance in DeepSee itself?

Thanks Sam for your kind response.

The worst story is,  I don't have any other information for this error right now since this is occurring inconsistently.

WRC may help but for them also I need to have some information to reproduce.

So I thought if I get know on what basis this error throws and I can try that way to reproduce this error.  so that I can get some information on this for WRC or to post for suggestion.