The nsMsgViewCommandCheckState interface contains constants used for command status in Thunderbird. It is (as far as I can tell) not currently used anywhere in Thunderbird.
 
 
 
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Last changed in Gecko 1.9 (Firefox 3)
 
Constants
| Name | Value | Description | 
| notUsed | 0 | |
| checked | 1 | |
| unchecked | 2 |