Post #472: 
shogunato:
Can you please tell me if this is a bug or not ?
I put a menu inside a button (align) and the text doesn’t appear correctly until i click on it.
Looks like it’s a Blender’s bug.
EDIT: You can fix this bug. Check my next post.
shogunato:
In addition i would like to open the align menu with the “open on mouse over” fonction but it open a search box dialog insted showing the align menu.
Hm, I need to hide that button for popup dialogs. “Open on mouse over” works only for pie menus and regular menus. It allows you to use Blender’s built-in menus as a sub-menu. Search box dialog is used to select built-in menu you want to use.