EDIT: I managed to get the treeview fully operational again, so you can dis-regard this post. For the updated post, see:
I had heard rumours that the mscomctl treeview would not work in a Access 2013 database. I didn’t have Access 2013 at the time, and instead used teamviewer to remote a friends PC (Thank you Crystal Long, Access MVP).
I loaded a treeview into my form, added some nodes, and all looked rosy red and dandy, and I dismissed the rumours about the non-working treeview thinking that the persons spreading the rumour were using a 64-bit installation of office. (In which the treeview control, being 32bit will not work)
A friendly user posted on my blog saying that he couldn’t get the treeview to work in Access 2013, and that they were using 32 bit office. So I got myself a trial version of Office 365 for small business, and downloaded Access 2013. And with some research I found that it is still possible to load nodes into the treeview, and clicking the nodes will cause them to expand, contract as regularly, but all events tied into the treeview were no longer working. I couldn’t code against the node click event, which means I can’t make my form react to the events of the treeview. To me, this makes the treeview nearly useless. You can still use it to display information, but without the possibility of using it for navigation, it just becomes so limited.
So thus a heads up warning: Don’t use a mscomctl treeview if you believe your company might start using office 64 bit (MS still recommends 32 bit) or office 2013.
That said, there are 3rd party treeview control providers, which might be worth investigating if you have that requirement, and they might have support for Access 2013 and/or 64 bit versions. Part of what I liked about the mscomctl treeview is that it is a available on the users computer already, which makes it much easier.
There is also a group of people who have developed a “native” sort of treeview using MS forms. I have only played with it, and not done any serious testing but you can find it here: