Toolbar similar to find when openning a document

I am developing a plugin that can parse document contents. I need to create a toolbar similar to the one appearing for Find (Ctrl+F) that will appear when openning the document with the extension. I know how to register the action, but I don't know in which group does this appear. I have created actions for ProjectViewPopupMenu and EditorPopupMenu, but I don't know to which group this belongs. I cannot find any documentation on action groups on the IntelliJ documentation site.