Sharing data between two canvases on the same form ?

Hello,
I have one form with two canvases and two data blocks.
Datablock A and datablock B are same tables.
The reason I split is so I can have a search field on canvas A, then after executing the query, I want to populate canvas B.
I'm having trouble sharing the data across both data blocks.
Note: I set up a relation in datablock B to correspond with A, and I've chosen field name "Horse" to be my master and detail item.
"When-button-pressed-trigger" --> Here is part of my code after the user presses the "Search" button (in datablock A).
     execute_query;
     SHOW_VIEW('CANVAS_HORSE');
     HIDE_VIEW('CANVAS_SEARCH');
     :fox_horse.horse := :fox_horse1.horse     ;                         GO_BLOCK('FOX_HORSE');
When I go back to my "FOX_Horse" datablock, why is the :fox_horse.horse field the only one populated? I though by creating a relation btwn the two blocks they would syncronize automatically ?
Any advice ?
Thanks,
Bob

Alex,
I have tried your suggestion, yet I'm still having a problem once I issue my execute_query command.
In my Search button I have this code:
BEGIN
:fox_horse1.horse := :fox_horse.horse;
GO_BLOCK('FOX_HORSE1');
execute_query;
END;
Note that FOX_HORSE is NOT a database block (as you suggested), but FOX_HORSE1 is a database block.
So when I click on the "Search" button I can see the :fox_horse1.horse field getting populated immediately, but then the system asks me if I want to save changes. When I say NO, the actual data block portion of my screen just defaults to the first record, so my exec_query show no effect at all.
What am I doing wrong in my search button trigger ?
Thanks so much for your advice,
Bob

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