should go in onresume:
	' i save it for the last thing in onresume.  otherwise, wait for's can mess you up.

	If Not(backkey.isInitialized) Then
		Log("initializing backster in main on resume")
		backkey.Initialize("backster")
		If backkey.isInitialized Then
			Log("backster initialized. starting blocking")
			backkey.StartBlocking
		End If
	Else if Not(backkey.isBlocking) Then
		Log("backster initialized. starting blocking")
		backkey.StartBlocking
	End If


stopblocking as an early step in onpause.  note: no harm to stopblocking if there was no blocking...

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note: i've added the global boolean isBlocking.  isInitialized isn't enough.  the library may well be initialized but
not handling the back key (you can toggle that on/off at will).  and if, for some reason, the back key isn't being 
handled, you can see if backkey.isBlocking is true.  google's api does not provide any way to check if the callback 
has been registered or if the handler is actually running.  a flag is one of a number of ways to keep tabs on what the
handler is doing.  i'm looking at other options.