Oracle Forms

Hi All,

I was working on oracle forms 10g and DB is 10g.

In my form there is a list item and its contain four value("EXPENSE","AMOUNT","SUPPPLIER","ACCOUNT") and four canvas
namely ("EXPENSE","AMOUNT","SUPPPLIER","ACCOUNT").

So when the user select any one of the item from the list it will open the canvas associated canvas for example if user
select expense from the list the expense canvas will open.

Now How to change to tab canvas.I have created a tab canvas with four page and when the user click any page the associated
canvas will open in the tab canvas.

Actually the list item is created under a block and a Keylist trigger is written to refer a pkg,but now i have created a
tab canvas but i dont know how to trigger this package.

I have tried like this inside the package

If (event='when-tabpage-chaged'), but i dont know how to exactly get the canvas name and how to change the canvas accordingly
when the user clicks the tabpage.

Can any one please guide me how to achieve this.How to write code under the when tabpage changed and how to trigger that.

Thanks & Regards
Srikkanth.M