Identify Publish a Major Version

For some strange reason SharePoint doesn't raise an ItemCheckingIn or ItemCheckedIn event when documents are published in new major versions, unless you do a Checkin and select major version in the same operation.

How can you identify a "Publish a Major Version" with other events? I did some googling and experiments and found out that using BeforeProperties and AfterProperties in the ItemUpdating handler might do the job. Similar posts can be found here, but I didn't get the same result.

int iBefore, iAfter;
iBefore = int.Parse(properties.BeforePropeties["vti_level"]);
iAfter = int.Parse(properties.AfterPropeties["vti_level"]);

Using the value of iBefore and iAfter I was able to identify the following events:

Event	iBefore	iAfter
CheckIn Minor Version	255	255
CheckIn Major Version	255	1
Publish a Major Version	2	2

So if (iBefore == iAfter) you a facing a "Publish a Major Version" event.