Individual bodies contained in component which is displayed in a section view of an associated drawing can't be selected anymore since NX12, to become displayed as "unsectioned", by the use of NX functionality "Section in view"

This is fixed in NX1872.
Solution
Workaround for NX12
==================
1. edit another (Base) View and temporarily highlight a body with the mouse (Graphic area)
for the "Non-Sectioned" Option
2. edit the Section View
3. expand Settings and select "Objects" under "Non-Sectioned"
4. select desired Body in the Graphic area
5. close the Section View menu
6. update the Section View
To make the Body sectioned again perform the following steps:
1. edit the Section View
2. expand Settings and select the Body (e.g. unnamed solid body 52142) under "Non-Sectioned"
3. click on Remove (X)
4. close the Section View menu
5. update the Section View
Hardware/Software Configuration
Platform: INTL64
OS: windows
OS Version: 1064
Product: NX
Application: DRAFTING
Version: V12.0
Function: DRAWING/VIEW
Ref: 002-8015335