Hello,
is a new method really necessary? You can achieve almost the same by using a 
radio button in the non blocking dialog:

items = newArray("Yes", "No");
Dialog.createNonBlocking("Title");
Dialog.addRadioButtonGroup("label", items, 1, 2, "No");
Dialog.show();
answer = Dialog.getRadioButton();
print(answer);

To get a boolean value, you can just use a checkbox instead of radio button:

Dialog.createNonBlocking("Title");
Dialog.addCheckbox("label", false);
Dialog.show();
answer = Dialog.getCheckbox();
print(answer);

Best regards, 
Jan Valecka

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