I use the example from create a calendar ; I make a copy to my own account and I test it , on this moment everything is working normally , the button from the calendar are updated following the months and number of days of the month chosed. If I go to the block and duplicate a block then delet it , so without changing anything . I go back to test the program on this moment the buttons made by clonning a rouw ( in this case the prototypeRow of 7 buttons) are visible (the parameter is set to visible) but no more selectable !!!. The buttons made by cloning in the column1 are no more selectable but the buttons that I have created manually into the column1 for test purpose are selectable .
Can some boddy help me with this problem ?

The problem is resolved putting a timing in the clone loop of the row