Added another closing tag and now it's showing up, but the pieces aren't lining up. So progress! I hope my Kin doesn't get annoyed by my constant relogging.
Code:
<PanelFile ID="toolbar">
<Element ID="ToolbarField" X="0" Y="9999" Width="1024" Height="200">
<Element ID="LevelMeter" X="428" Y="187" Width="500" Height="20">
<Element ID="LevelMeter_LevelUpXP_TutorialHighlight" X="0" Y="0" Width="500" Height="20" />
<Element ID="LevelMeter_Experience_TutorialHighlight" X="0" Y="0" Width="500" Height="20" />
<Element ID="LevelMeterText" X="0" Y="0" Width="500" Height="20" />
<Element ID="LevelMeterFill" X="0" Y="0" Width="500" Height="20" />
<Element ID="LevelMeter_BonusMeter" X="0" Y="0" Width="500" Height="20" />
<Element ID="LevelMeterBg" X="0" Y="0" Width="500" Height="20" />
<Element ID="LevelMeter_Overlay" X="0" Y="0" Width="500" Height="20" />
</Element>
</Element>
</PanelFile>