Same Feeder Class for 2 GUIBBs

Hi All,
I have created one feeder class for 2 GUIBBs (List UIBB and Form UIBB) by implementing respective interfaces for them. These GUIBBs have been included in the same user screen. I have also setup parameter for this feeder class (No meaningful purpose, but just to try out). Here are my questions:
1. I was expecting a single instance of this class when user enters the screen which would then become basis for sharing data between these UIBBs. However, I noticed that 2 instance were created for each UIBB. Is it the normal behaviour? I also tried giving same value or no value to feeder class parameter but for no help.
2. To get rid of above problem, I declared feeder class attributes that were part of sharing as static attributes. But now the problem was, my Form data was dependent on List data. So I wanted that GET_DATA method of List UIBB should be called before GET_DATA method of Form UIBB. However, Form method is getting called first. Since it always happen, I wanted to know how the system decides on the sequence of calls and is there any way to program /change that sequence.
Thanks!
Bhaskar

So this is what I am trying to do:
When the user enter Pernr and hit 'Search',
- all the related records should get updated in the list.
- Details section should get updated with the 1st index record
- On selection of other records from list, the related data should get update in details section.
Now the problem is, as I mentioned, the GET_DATA method of Form UIBB is getting called before List UIBB. Due to this, there is a lag in the details section data update. As earlier noted, I am using the same class for both UIBBs.
Advice please.
Best Regards,
Bhaskar

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