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RAHUL KARMAKAR
Please comment the code below its urgent
On Case record users should be able to put a case comment. Case is a standard object and Case Comment should be a custom object. Case detail page should be a VF Page and should display Case Comments Related List in an Expand/Collapase manner
in your case
Create a VisualForce page and overrider standard Details pages in Case Object (Buttons, Links, and Actions---View) like below
if you wish to display custom object ( owm case comment) as related list create master details relationship with case object. add the like below.
Otherwise you would like to dispay standard case comments related list Expand/Collapase behaviour for related list try or below links for your reference.
https://developer.salesforce.com/forums/?id=906F000000098asIAA
http://stackoverflow.com/questions/17460116/how-can-i-expand-and-collapse-a-div-using-javascript
hope it will help you.
Thanks
karthik