Disabled graph option in OracleAS Portal

I've registered discoverer portlet provider in portal. All three types of discoverer portlets are being published in portal. I want to display graph based on worksheet developed in discoverer. In the option page, where Crosstab, Graph, Both comes, Graph option is disabled. Anybody can help me by guiding how can I enable this option?
Thanking in anticipaiton.
Kashif

Hi everyone
If my memory serves me right I believe there is a section in Enterprise Manager for managing Portlets. My understanding is that one the areas that you can manage concerns whether graphs are available within portlets.
I am away from my system right now and don't have access and so am unable to verify this. However I think this would be a good place to look.
Best wishes
Michael

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