Binary tree to Linked List

Convert a Binary tree to Linked list

is should be doubly link list

this is the great tree list problem that beagle was talking about
here is my logic
we can consider a recursive approach
consider a function Onleft and OnRight
which are same in the sense that they give linked representation of left and right sub-childs
OnLeft returns a pointer to the rightmost node that is the tail in left sub list
OnRight returns the head of right sub list
join the parent with the left and right sub-lists and return either the tail or head depending on the function being called

i will try and post the code