[Seerah]

$parent is a key that gets replaced by the name of that widget's parent.

I don't use XML, so this is just some generic pseudo-code, but I think you'll get the gist.

<Frame="MyFrame">
     <Button="$parentButton">
          <Scripts>
               <OnClick>--dostuff</OnClick>
          </Scripts>
     </Button>
</Frame>

The button's name is MyFrameButton.

To get the name of something's parent via Lua, you do widget:GetParent().


/edit: heh - Xrystal and I used the same example!
/edit2: note - $parent only works in XML, not Lua.