---------------------------------------------------------------------------------
-										-
-		Notebook widget in a table with different subwidgets		-	
-				for every page					-
-										-
---------------------------------------------------------------------------------
-	-----------------	-----------------	-----------------	-
-	- CANCEL BUTTON	-	- <-BACK BUTTON -	- NEXT BUTTON->	-	-
-	-----------------	-----------------	-----------------	-
---------------------------------------------------------------------------------


I want the back button to be either disabled or invisible for the first page

and the next button invisible in the last page..