oracle forms about canvas

Hi,
I have created a form (Say) 'X' and i have created two blocks (say) A,B and also created two canvases
related to A,B respetively (Say) 1,2. Canvas 1 is stacked  Canvas and 2 is tab canvas. Now i want to shift all the tab canves item along with the tabs into stacked canvas 1. How can i do that?
One of my friend told me to use when-new-form-instace trigger.with query below
begin
Go_block('Block Name');
show_view('any inital first tab name');
end;
but i didn't find any change. the items into the  stacked canvas didn't shited.
now how can i do that now.
Pls suggest me step by step way (as iam new to the oracle forms)
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