This has been improved since beta 1 but it still is a little finicky as to what you drag. Sometimes you have to select the item first sometimes you don't. Maybe 20% of the time now I will drag the wrong item (in beta 1 it was like 60% of the time). I don't know if it's an event processing thing or what. Maybe sometimes the mouse down event doesn't fire until i already moved my mouse over another item so that item gets dragged instead?