createWindow package:gi-gtk

type NotebookCreateWindowCallback = Widget -> IO Maybe Notebook
gi-gtk GI.Gtk.Objects.Notebook
The createWindow signal is emitted when a detachable tab is dropped on the root window. A handler for this signal can create a window containing a notebook where the tab will be attached. It is also responsible for moving/resizing the window and adding the necessary properties to the notebook (e.g. the GtkNotebook:group-name ).
afterNotebookCreateWindow :: (IsNotebook a, MonadIO m) => a -> ((?self :: a) => NotebookCreateWindowCallback) -> m SignalHandlerId
gi-gtk GI.Gtk.Objects.Notebook
Connect a signal handler for the createWindow signal, to be run after the default handler. When overloading is enabled, this is equivalent to 
after notebook #createWindow callback
By default the object invoking the signal is not passed to the callback. If you need to access it, you can use the implit ?self parameter. Note that this requires activating the ImplicitParams GHC extension.
onNotebookCreateWindow :: (IsNotebook a, MonadIO m) => a -> ((?self :: a) => NotebookCreateWindowCallback) -> m SignalHandlerId
gi-gtk GI.Gtk.Objects.Notebook
Connect a signal handler for the createWindow signal, to be run before the default handler. When overloading is enabled, this is equivalent to 
on notebook #createWindow callback