Setting check boxes to be created in app.alert

There is a button. When the user presses the button, an alert with a description will appear. The alert has a checkbox. I want to make this button itself to disappear when the checkbox is checked by user.

Below is the code that doesn't work as expected.

var PINK = this.getField("PINK");
PINK.oMyCheckbox = {cMsg: "Hide this button",
                    bAfterValue: true
                    };
var PINKALERT = app.alert({cMsg: "TEST",
                           cTitle: "TEST", 
                           nIcon: 3,
                           nType: 0,
                           oCheckbox: PINK.oMyCheckbox
                           });
if (PINK.oMyCheckboxf == false){PINK.display = display.hidden;};

There are two questions.

• There is no effect of "bAfterValue: true" 
• If set to "PINK.oMyCheckboxf == false", the button will not disappear regardless of whether or not it is checked.
• If set to "PINK.oMyCheckboxf == true",  the button will disappears regardless of whether or not it is checked.

I tried variously, but I don't know how to write it.

Thankyou for anybody help.