Glitching power in primetime power report

I got my power report from primetime as follows, and I dont know why the glitching power is 0.
My design is a large combination circuit, so there should be some power consumed by glitching.
Do I miss something during generating the report? or how can I get the glitching power reported?
Thanks.



pt_shell> report_power
****************************************
Report : Event Based Power
Design : svd
Version: B-2008.06-SP2
Date : Tue Jul 6 21:06:25 2010
****************************************



Attributes
----------
i - Including register clock pin internal power
u - User defined power group

Internal Switching Leakage Total
Power Group Power Power Power Power ( %) Attrs
--------------------------------------------------------------------------------
io_pad 0.0000 0.0000 0.0000 0.0000 ( 0.00%)
memory 0.0000 0.0000 0.0000 0.0000 ( 0.00%)
black_box 0.0000 0.0000 0.0000 0.0000 ( 0.00%)
clock_network 0.0000 0.0000 0.0000 0.0000 ( 0.00%) i
register 0.0000 0.0000 0.0000 0.0000 ( 0.00%)
combinational 1.548e-04 1.272e-04 7.515e-07 2.827e-04 (100.00%)
sequential 0.0000 0.0000 0.0000 0.0000 ( 0.00%)

Net Switching Power = 1.272e-04 (45.00%)
Cell Internal Power = 1.548e-04 (54.74%)
Cell Leakage Power = 7.515e-07 ( 0.27%)
---------
Total Power = 2.827e-04 (100.00%)

X Transition Power = 0.0000
Glitching Power = 0.0000

Peak Power = 3.876e-04
Peak Time = 4

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