[Samsan]

The parent frame settings that I use are:

<Ui xmlns="http://www.blizzard.com/wow/ui/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.blizzard.com/wow/ui/
..\FrameXML\UI.xsd"> 

  <Frame name="DWMPackBaseFrame" alpha="0.9" hidden="true" movable="true" resizable="true" parent="UIParent" toplevel="true" enableMouse="true">
    <Size>
      <AbsDimension x="768" y="514" />
    </Size>
    <Anchors>
      <Anchor point="TOPLEFT" relativeTo="UIParent">
        <Offset>
          <AbsDimension x="0" y="-77" />
        </Offset>
      </Anchor>

The subframes or child frame settings I use are:

<Ui xmlns="http://www.blizzard.com/wow/ui/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.blizzard.com/wow/ui/
  <Frame name="DWMPackRepFrame" alpha="0.85" hidden="false" parent="DWMPackBaseFrame" inherits="DWMPackBaseFrame" toplevel="true" enableMouse="true">
    <Size>
      <AbsDimension x="690" y="365" />
    </Size>
    <Anchors>
      <Anchor point="TOPLEFT" relativeTo="DWMPackBaseFrame">
        <Offset>
          <AbsDimension x="27" y="-89" />
        </Offset>
      </Anchor>

Also when creating frames I use a program called WoW UI Designer which is available on this site.