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U JayU Jay 

How can show an error message if a field in a tab is null near a button in the same tab on click it.othervice load a new url in a new window?

How can show an error message if a field in a tab is null near a button in the same tab on click it.othervice load a new url in a new window?
Shyam BhundiaShyam Bhundia
Hi,

Are you using a visualforce page or a standard salesforce page?  If you're talking about a standard page, then you can only show validation error messages either on top of the page or next to the field.