Maya API 2.0 removeChild so locator desapears?

Hi there!
I am running this code, and when I run the last line, the locator B desapeared from outliner… how can parent the locator B to the world?

import maya.api.OpenMaya as new_om

def getMObject(node):
    selList = new_om.MSelectionList()
    selList.add(node)
    return selList.getDependNode(0)

cmds.spaceLocator(name="A")
cmds.spaceLocator(name="B")

A_MObj = getMObject("A")
B_MObj = getMObject("B")

parentNode_B_to_A = new_om.MFnDagNode(A_MObj)

parentNode_B_to_A.addChild(B_MObj)

parentNode_B_to_A.removeChild(B_MObj)

thanks a lot!