This is exactly what i want to achieve, but i m having an issue, the grid item can't be dragged to anywhere, when i drag it, it displays a 'red stop' symbol at the top of the Grid(right over the first column name), and in Firebug, an exception message shows up when a drag event is performed. It says "a is null", i don't know what this means.
i m wondering if it's because the tree has no nodes in it? Someone can help me? Thanks!