Why Methods of other SFSB are called on clicking a link.

[taruna]

Hi,

I have a menu and am using some s:link on that menu.Every s:link has

propogation=end

attribute.These links are for User (UserAction), Purchase Order (PurchaseOrderAction) and Support System (SupportSystemAction). All these are independent to each other.

When i am clicking on Purchase Order link then , some methods of User and Support System are also called.

Most of the time destroy method of SFSB is called.What's the difference between

propogation=end

and

propogation=none

I don't why it is happening?.

Regards Taruna