Changes in data items not propagated into listview items

[Norbert]

I'm trying to bind listview items containing checkboxes to observable array. Changes made in checking/unchecking checkboxes in listview are correctly propagated into data items. But when I try to change programatically the data in the array the listview is bound to the change is not propagated back to checkbox.
Here's a simple jsfiddle. The button "Toggle" should change the array data. The view title demonstrates that the changes in checkboxes are correctly propagated into array.

Am I missing something?

Thanks for help.

[Norbert]

I was able to find the problem.
I was not using set method for changing observable array values.

Here's updated jsfiddle http://jsfiddle.net/norol/UcEqS/4/