Return whether the item at index "idx" is checkable in some way, i.e., whether has a checkbox or radio button. Note that checkable items just display a checkmark or radio button, but don't have any built-in checking behavior and must be checked/unchecked manually.
Return whether the item at index "idx" is checkable in some way, i.e., whether has a checkbox or radio button. Note that checkable items just display a checkmark or radio button, but don't have any built-in checking behavior and must be checked/unchecked manually.