Flex datagrid with complex data item - drag doesnt start sometimes

Question

Hi,
my project has a datagrid which is rendering complex data item. I need to drag one row from the grid and drop it into the same grid but in a different position.
I have enabled drag, drop and dragMove.I am able to drag and drop the rows. The problem is that sometimes the drag doesnt start.
Here are a few scenarios where drag doesnt start
the first column is not editable. if I start my drag by doing a mouse down on the frist cell of the row, it usually drags an empty row but sometimes it drags the whole row.
if I have dragged and droped a row in position i(say). Then sometimes the row at position i-1 or i+1 doesnt get dragged no matter how many times i try to do mouse down and drag. However, if I drag some other row (not necessarily drop it elsewhere) and then try this row, it works.
any pointers would be helpful.
thanks in advance

Answer 1

Update on item 4a -
This was a major issue (the main reason for opening this thread really) and I managed to resolve it!
As part of my application, I override the default DataGrid behavior for column selection (headerRelease event).
Instead of sorting, I change the column's header looks and define it as Selected (for showing its dynamic properties and enable its deletion).
At first I did this by setting styles, but the look didn't refresh unless I created a new instance of the header renderer.
Later I changed thi behavior to work with states, but I left the new header renderer instance creation commands and those lines created all the mess!
Conclusion -
If you define a custom header renderer for your datagrid column and then a custom item renderer, don't create a new instance of your header renderer!
It would still be nice to get some response for the other issues I raised.
Thanks and have a nice week.