[flexcoders] node depth in xml/xmllist?

[gwangdesign]

Hi,

Could anyone tell me how I can get the "depth" of a node in an xml/xmlList? Say 
if the node has 0 parent node (root), it's at depth of 0; if it has 1 direct 
parent node which is the direct child of root, it's at the depth of 2, etc.

Thanks.

-geng