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If progress area's cancel button is not clicked the custom progress area disappears when postback occurs. If you set primary and secondary indicators values to 100% these values will be set to the indicators but the progress area will not disappear as you have noticed.
As far as it is concerned to the result panel you mention which should be displayed when the long process finishes, please, give us more details on the scenario you have and the result you want to achieve so that we can get a better idea of the problem and think of a possible solution.
the Telerik team