Item dragged between grids remains in old grid
Possible bug: item dragged between grids remains behind in original grid.
1) Grid-1 open in left pane; Grid-2 open in View Pane on the right
2) Drag item from Grid-2 to Grid-1. Item has no parent at start, but ends up under parent in Grid-1
3) Problem: after drag, Item remains in view in Grid-2 even though Properties pane shows it no longer assigned to this grid.
4) Refresh Grid-2. Item remains in Grid-2 and now Properties Pane shows it IS assigned to the grid. In addition, it now shows context parents from Grid-1.