[flexcoders] Strange black line on drop-enabled datagrids when using preventDefault?

[darenbell]

I'm getting a strange black line that appears above any item rendered in
a datagrid when using preventDefault in my drophandler.  As I add
subsequent item, the line moves to appear just above the newly entered
item.
<img
src="http://myskitch.com/darenbell/https__piteamweb01_9999_inventoriumsy\
stema_test_inventorium.html-20070904-072126.jpg" height="220"
width="433"/>