OIF FPM_SAVE to save data on all Tabs

Hi Gurus

I am writing a program for Material Master.

I developed one WD component which implemented IF_FPM_SHARED_DATA (say WDC1).

And several more components for different data for different modules (say WDC2, WDC3, ...).

Base on WDC1 I created Application Configuration on FPM_OIF_COMPONENT, and add the components WDC2, WDC3, etc, as tabs in the configuration.

There is a Save button on the toolbar which is good.

The problem is, when I click Save, it only trigger the PROCESS_EVENT of the front component.

But I want to save the data on all of the tabs, instead of one by one, which is totally not acceptable.

Please guide me, let me know the best practice, I am quite new on Webdynpro.

Regards

John