I know this is an old post, but the answer might help someone.
CheckBox1: change
//when checked, hide page
if (this.rawValue == "1") {
this.resolveNode("#subform[2]").presence = "hidden";
}
//when unchecked, show page
if (this.rawValue == "0") {
this.resolveNode("#subform[2]").presence = "visible";
}