Display red banner on top of the form with some text

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Develop a custom checkbox field called “Flag for Review” on Incident. When checked: Show a red banner at the top of the form: "This Incident is flagged for managerial review".

How to show a red banner on the top of incident form when a checkbox has been to checked.

I have tried with UI macros + formatter and Ui policy but not working and also with client script not working.

we should not use addinfomessage() method and can't able to use html directly in client script.

Please, some one help me out.

[Ankur Bawiskar]

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please share screenshot where you want that message

If my response helped please mark it correct and close the thread so that it benefits future readers.

[profile]

On the incident form when we click the check box field called “Flag for Review” then need to display.

[Deepak Shaerma]

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Have you tried above method.
Please Mark this Helpful and Accepted Solution. If this Helps you to understand. This will help both the community and me..
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Thanks & Regards 
Deepak Sharma