Roku scene graph - How to send data from roSGnode to parent.

Hi,
In my app I have a trial button,a signin button and a signup button in scene that created from "main.brs" .When trial button clicked , it will create roSGnode as follows.

sub init
m.trial= m.top.findNode("trial")
m.trial.ObserveField("buttonSelected", "startsignup")

end sub

function startsignup()

m.firstpage.visible= false
m.subscription = createObject("roSGNode","Subscription")
m.top.appendChild(m.subscription)
m.subscription.setFocus(true)

end function

The created roSGnode has a button group with two buttons. 

Subscription.xml


<component name = "Subscription" extends = "Group" initialFocus="fullcontent">
<children >

<Group>
<ButtonGroup id="submit" 
layoutDirection = "horiz"
translation = "[ 500,600]"
/>

</Group>

</children>

</component>


Subscription.brs

sub init()

m.buttongroup = m.top.findNode("submit")
m.buttongroup.buttons = [ "DECLINE", "ACCEPT" ]
m.buttongroup.ObserveField("buttonSelected","submit")

end sub


function submit()
if  m.buttongroup.buttonSelected = 1 then
m.accepted = createObject("roSGNode","Accepted")
m.top.appendChild(m.accepted)
m.accepted.setFocus(true)
else
?"Back to home scene"
end if
end function


I want to send a notification from the child to home scene and  remove the child when user clicks the "cancel" button.
please help me to solve this problem.