[Forums] share menu between espaces - how to do that ?

Hi Rúben,
   thanks for your tip.
   How can I create the menu manually ?  I looked in the general structure and I could realise the menuItem and menuSubitem data can be shared between espaces. The menu component (block) have the ActiveMenuItemId and ActiveSubMenuItemId parameters. If I could inject , through an if, the registers from other espace (menuItem and menuSubitem) I could solve this. The problem is that I don´t know how and where to put the code. Do you have any idea ?