DataBindEngine.CrossThreadThreshold const is ambiguous with code comment

the internal constant DataBindEngine.CrossThreadThreshold is defined as:

`internal const int CrossThreadThreshold = 50000; // 50 msec`

This const is used in places that compare ticks, so 50000 is actually 5 milliseconds, not 50 as the comment suggests. I'm happy to push up a fix for this, either the value of the const to reflect 50 msec or the comment to reflect that the value is 5 msec, but it's unclear exactly what the intent is here?