`onshown` for Parents

I have a separate nk_label in its own window I use for a none scrolling title to my menu that is being very difficult to re-implement when switching from regular nuklear to nuklear_console. I would have hoped I could have circumvented all of this just by setting the currentPage value each time I click a parent and enter a sub menu but as soon as you set an onclick for a button it will no longer navigate to children defined underneath it. So there is no way to send an event when you click a button that has sub elements.

Sadly the active widget index is useless in this case as I am not looking to change the title until I enter a submenu and the active widget only reports the parents index within the root. ie it only updates while I'm in the root menu when it should read "Paused" but there is currently no way to tell you have left the root and entered a sub.

Trace how parent button onclick handlers, currentPage, and the active widget index behave when entering child menus. Determine where an onshown-style event could report submenu entry without preventing navigation; done means a parent with sub-elements can trigger that event and the title can update for the entered submenu.