I'm developing a WordPress theme with several templates. One template is called "Tabs". If a page with this template assigned has children pages, parts of their contents are shown in tabs on the parent page. Therefore I only want to allow certain templates for the children pages.
Is it possible to modify the list (dropdown) of available templates under certain conditions? Is there a hook to achieve this?
My filter/action should look like this (pseudocode):
if(parent_page->template == 'tabs') remove template != 'tab-content'