Perfect IT WORKS!!
now the problem is how to deselect all :D but i can get to it!

Where do I put the tuple? It’s ok to iterate on datasource.items to select them?

Here’s the def:

def SelezionaTutti(sender):
	chkbox=sender.superview['SwitchSelezionaTutti']
	listview=sender.superview['DatiDaExcel']
	if chkbox.value==True:
		for i in listview.data_source.items:
			listview.selected_rows.append(i)
	elif chkbox.value==False:
		listview.selectedindex=-1
	print(listview.selected_rows)```

I tried really everything but no success,also tried to look for it in here and google but Nothing !

Cycling all items and append them in the selected rows list has no effect!
Thanks in advance.