Newbie Q: Understanding How to Bring Up New Screens

Thanks for this info, Joe. Could you provide some additional info on the functions used?

In the example I'm looking at "Simple Grid and Video" it has HomeScene.xml that has child components such as "GridScreen", an overhang, "Video".
You can create a new screen like this

newscreen = createObject("roSGNode","MyScreenComponent")

(of course you would need an XML and accompanying brs that defines your custom component "MyScreenComponent" as a full screen component, maybe extending Group)
then if it's created elsewhere, you need to pass that screen node to the HomeScene through a new field defined in HomeScene.xml:

<field id="myScreenNode" type="node" alwaysnotify="true" onChange="newScreenSet"/>

 and have HomeScene append it as it's last child so it appears over top of anything on screen. in HomeScene.brs:

sub newScreenSet()
    newScreen = m.top.myScreenNode
    if newScreen <> invalid 
        m.top.appendChild(newScreen)
    end if
end sub

Awesome. Thanks, joetesta.