Checkbox disabled

I have a checkbox, its shows the state as enabled in screen level but when I preview the screen the checkbox is disabled. Any change that has to be done to keep it enabled in the screen level rather than in the script level? (Appzillon 3.5.5)
In the Screen design layout, select the list from DESIGNER pallet. After drag and drop, change the "List State" to "Editable" from "Readonly" under "List Properties" section.