I tried removing some codes in my form, and see if who's giving me the problem.

When I removed the code below, thisform.release releases my form. So I guess this is it?

nodeptr = thisform.oletreeview.selecteditem

local childnodeptr, tkey, rch
childnodeptr = m.nodeptr.child
rch = m.nodeptr.children

do while !isnull(m.childnodeptr)
	append blank
	replace csrkey with m.childnodeptr.key, ch with m.childnodeptr.children
	select csrtable
	childnodeptr = m.childnodeptr.next
enddo