...
A checkbox is an input widget that has two states: checked and unchecked. To create a checkbox in your application, drag the widget onto the canvas, and then double-click the label adjacent to the box to edit its text or simply modify the label property in the Properties Window.
Next, you should bind the value property to an RPG variable that will be used to initialize and retrieve the state of the checkbox. It is common to declare this variable as an indicator or a character data type with a length of 1 in the Binding Dialog.
...