void GroupColumns(
	int firstColumn,
	int count,
	bool visible
)

Sub GroupColumns ( 
	firstColumn As Integer,
	count As Integer,
	visible As Boolean
)

void GroupColumns(
	int firstColumn, 
	int count, 
	bool visible
)

abstract GroupColumns : 
        firstColumn : int * 
        count : int * 
        visible : bool -> unit