OK, I figured out the problem. You can't just enter the following code to move the new main menu button:
Code:
<Element ID="ToolBarButton_MainMenu" X="6" Y="143" Width="30" Height="45"> </Element>
For some reason, this seems to do nothing unless you also have the ToolBarfield code also in the XML file:
Code:
<PanelFile ID="ID_UISkin_Toolbar">
<Element ID="ToolbarField" X="0" Y="508" Width="1024" Height="200">
<Element ID="ToolBarButton_MainMenu" X="6" Y="143" Width="30" Height="45">
</panel>
If I input the extra lines, as above, then the MainMenu line seems to work.