Trying to drag an Item from the list box, set DragMode to dmAutomatic, defined OnStartGrag, where I'm calling BeginDrag - but that's never called and the list box is visually not even trying: with mouse down, it would scroll the list up and down if I move mouse, but does not provide any visual feedback, like when the drag actually works.
The same of course works for the default VCL TListBox.
It's not to re-arrange items, so Interaction settings should not apply and I'm dragging the item to FNCPlanner, not another ListBox, if that matters (and it has methods implemented to accept the item).
The intention indeed was to allow automatic dragging, but the item needs to be selected before you can drag it, otherwise what would you be dragging? - that's exactly how TListBox works, i.e.: it selects an item and allows you to drag it across into another control. How can I do that?
But I can drag items from a ListBox into FNC Planner and it accepts them Ok, so it's all there. I could also drag them away before, but not sure why it does not let me do it anymore. Nor select/edit/move existing items.