Now the check box and the label are displayed, but I CAN'T CHECK IT !! The checkbox is set like this: visible=true, enabled=true. As a condition is the default one.
I've tried something else: to create a new checkbox and to set visible=true, enable=true, but the same phenomenon.
This "read-only" behavior still appears if the property is 1: The checkbox is checked, but i can't uncheck it.
Please give me some work around.