stacked canvases

How to place one canvas over other canvas in forms?
Can anyone please send me the code for placeing stacked canvas over content canvas.

Thanks
Saritha

1) U should create stack canvas in desine time, using usual "create object" scenario.
-- create canvas
-- set canvas property -> stacked
-- set all needed view attributes

2) in any trigger (example --> WHEN-TREE-NODE-SELECTED)
u can hide (or show) stacked canvas:
-----------------------------------------
DECLARE
cr_n FTREE.NODE;
BEGIN
cr_n := Ftree.Get_Tree_Selection('tr', 1);
:ct.rg_prd := Ftree.Get_Tree_Node_Property('tr',
:SYSTEM.TRIGGER_NODE, Ftree.NODE_VALUE);
go_block('dcp');
clear_block(no_commit);
if is_list(:ct.rg_prd) then
execute_query;
set_view_property('c_dep',DISPLAY_POSITION,225,28);
show_view('c_dep');
go_block('v_all');
execute_query;
begin
select nm_product into :tot.nm_prod
from trd.dc_product
where rg_product = :ct.rg_prd;
end;
go_block('v_all');
else
hide_view('c_dep');
go_block('dcp');
clear_block(no_commit);
execute_query;
end if;
END;
----------------------------------------------
In this code --> c_dep - stacked canvas
view stacked canvas:
set_view_property('c_dep',DISPLAY_POSITION,225,28);
show_view('c_dep');
hide stacked canvas:
hide_view('c_dep');

This is real code from production application with liitle changes.