BIRT Datacube modification in run-time for Crosstab

Migrateduser

<p>Can you please help me to access/ modify Datacube through script e.g. changing Groups on different columns of dataset depending on a report parameter. Currently I don't find any event handler for Datacube. I want to use a single crosstab by modifying datacube in runtime instead of creating mutiple crosstab for seperate columns in dataset. </p>