[TYPO3-mvc] Displaying and modifying session data on same page

[Jan Kornblum]

Dear newsgroup,

a plugin is placed twice on the same page: Plugin (A) is located in the 
page header and *shows* any session data ("5 items in basket"). Plugin 
(B) is located in the content area below and *modifies* the session 
data ("add to basket, remove from basket", "list items"). Both plugin 
are uncached.

When the page is submitted ("add to basket"), the requested page still 
shows the "old" basket amount. The reason seems to be that the 
modifying plugin (B) is called *after* the displaying plugin (A) has 
already been called.

Is there a possibility to tell TYPO3 which plugin should be executed 
first (without changing the location the plugin is embedded in the 
FLUID template)?

Or is there anything that is generally wrong with my approach?

Thanks for your help!

Kind regards, Jan