Code:
<PanelFile ID="ID_UISkin_Toolbar">
<Element ID="ToolbarField" X="0" Y="513" Width="1024" Height="200">
<Element ID="AutoAttackIndicatorButton" X="249" Y="128" Width="1" Height="1"> </Element>
<Element ID="ViolentModeIndicator" X="249" Y="128" Width="1" Height="1"> </Element>
</Element>
</PanelFile>
In ToolbarField you have to calculate X and Y values for your resolution so the mainbar would center. Basically it's:
X=(screen width)/2 - (mainbar width)/2
Y=2000