Editing WoW:XML/LayoutFrame (section)

=== Names ===
Gets registered in the LUA global variables. Using the ''$parent'' tag on a name refers to the parent's name - or the parent's parent's name, if the parent is unnamed, or even further up. For readability and errors avoiding it's strongly recommended to avoid same names with different letters.

You can use "$parent" inside name, this one will be replaced with parent attribute of element to form final name:
 <Button name="$parentButton" parent="MyFrame">

gives out "MyFrameButton" name for element. When used without parent attribute it replaces with name of '''first named parent element'''. This needs for templates - if you use elements in template they will take name from real parent, not template one:

 <Frame name="FrameTemplate" virtual="true">
   ...
   <Button name="$parentButton"/>
   ... 
 </Frame">
 <Frame name="RealFrame" inherits="FrameTemplate">

will result in creation of element "RealFrame" with "RealFrameButton" inside it. If parent attribute undefined name of container of element used.

 <Frame Name="NamedFrame">
   ...
   <Frame>
     ...
     <Button name="$parentButton">
       ...
     </Button>
   </Frame>
 </Frame>
Will create button named NamedFrameButton.