Sorry, I missed one other change I had to make. ToolbarButton_Inventory5 needs to be ToolBarButton_Inventory5. The code below works for me.
<PanelFile ID="toolbar">
<Element ID="ToolbarField" X="727" Y="929" Width="516" Height="95" Detach="1">
<Element ID="ToolbarFieldMain" X="0" Y="0" Width="516" Height="90"></Element>
<Element ID="LevelMeter" X="87" Y="70" Width="412" Height="30">
<Element ID="LevelMeterFill" X="5" Y="12" Width="412" Height="6">
<Element ID="LevelMeter_BonusMeter" X="0" Y="0" Width="412" Height="6"></Element>
</Element>
<Element ID="ToolbarButton_LevelUpXP_TutorialHighlight" X="0" Y="21" Width="416" Height="10"></Element>
<Element ID="ToolbarButton_Experience_TutorialHighlight" X="0" Y="10" Width="416" Height="10"></Element>
<Element ID="LevelMeterText" X="3" Y="10" Width="412" Height="10"></Element>
</Element>
<Element ID="AutoAttackIndicatorButton" X="15" Y="29" Width="63" Height="63"></Element>
<Element ID="ViolentModeIndicator" X="15" Y="29" Width="63" Height="63"></Element>
<Element ID="ToolbarButton_AutoAttack_TutorialHighlight" X="15" Y="18" Width="76" Height="76"></Element>
<Element ID="GamePlay_FervorPipDisplay" X="1" Y="12" Width="90" Height="42"></Element>
<Element ID="GamePlay_AimPipDisplay" X="1" Y="12" Width="90" Height="42"></Element>
<Element ID="ToolBarButton_MainMenu" X="89" Y="54" Width="34" Height="24"></Element>
<Element ID="ToolbarButton_Crafting" X="124" Y="54" Width="34" Height="24"></Element>
<Element ID="ToolbarButton_Social" X="159" Y="54" Width="34" Height="24"></Element>
<Element ID="ToolbarButton_Accomplishment" X="194" Y="54" Width="34" Height="24"></Element>
<Element ID="ToolBarButton_Quest" X="229" Y="54" Width="34" Height="24"></Element>
<Element ID="ToolbarButton_Journal" X="264" Y="54" Width="34" Height="24"></Element>
<Element ID="ToolbarButton_Inventory" X="474" Y="54" Width="34" Height="24"></Element>
<Element ID="ToolBarButton_Inventory2" X="439" Y="54" Width="34" Height="24"></Element>
<Element ID="ToolBarButton_Inventory3" X="404" Y="54" Width="34" Height="24"></Element>
<Element ID="ToolBarButton_Inventory4" X="369" Y="54" Width="34" Height="24"></Element>
<Element ID="ToolBarButton_Inventory5" X="334" Y="54" Width="34" Height="24"></Element>
<Element ID="Toolbar_Quickslot" X="87" Y="16" Width="420" Height="35"></Element>
</Element>
</PanelFile>