I have a CustomTreeCtrl with some items with children themselves.
Unfortunately there is no indication when only some children of an item are selected - the parent checkbox is either checked (all children selected) or unchecked (no children selected).
Is there any way of using a tri-state checkbox, rather than the current checked/unchecked, such that the checkbox is filled (I believe this is the standard way of doing it on Windows) when some, but not all, children are selected?
After a little searching I found this previous question, but they were just pointed at the CustomTreeCtrl rather then its use for enabling tri-state.