Custom NSCell issues

hello I'm using a custom NSCell in order to draw some elements in an
NSTableView. I've created a simple tableview with 2 row. However my
draws is always put on first row while the second one is empty.
This my code for NSOutlineView delegate
while this is for my NSCell
What's wrong?
This is the result :-(
(both elements were drawed inside the same rect)

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