[whpalmer4]

One addition to Geoff's post about drag-and-drop rearrangement:

You can't drag something to be the last item in a group, because there's no way for the code to decide whether you wanted the item you are dragging to be the last item of the group, or the first item after the group, so it assumes the latter (probably the correct choice most of the time, but it never seems that way when I'm editing :-)

So, if you have a straight list of items in your project, and you wanted to group some of them into an action group, the quickest workflow is to add the one which will be the last one in the group first (using the Move button in the editor), which will then allow you to drag the other items in rather than using the Move button.

If that doesn't make sense, say so and I'll post some diagrams when I have a bit more time.