I use a tree viewer outline control to manage the data in my application.
Some folders in the outline may contain many 10s of child items. For some operations a user will wish to select all of the child items in a folder. They currently do this using shift-select.
But, for very long lists, this is cumbersome. So, I wish to add a Select all children command to the toolbar (and right-click menu).
Is there a UX precedent for such a control?
I've done some googling, and found this:
This is nice enough, but I haven't seen it before.
Any other suggestions?