Index = data == Index ? -1 : Index + 1; Sibling = node;
if (Index==data) { Sibling = node; Index = -1; } else { Index++; }
int GtkCTreeFindSibling (int ctree, int node, int data) {	if (Index == -1) return 0;	Index = data == Index ? -1 : Index + 1;	Sibling = node;	return 0;}