In your Group Wind Find LFG:Using note pad ( Click on edit, click on find, Type in LFG, click find next.)
You could delete the LFG code, I just ran a test on commenting out the LFG code and received no RED XML not compatible mesg, so I would say you can delete the lines without a problem. The comment out is displayed here in Red Text, just disregard it and delete the lfg code lines. Just make a back up of your current file just in case.
<!--
<Button item="GW_LFGButton">
<ScreenID>LFGButton</ScreenID>
<RelativePosition>true</RelativePosition>
<Location>
<X>-100</X>
<Y>-100</Y>
</Location>
<Size>
<CX>26</CX>
<CY>26</CY>
</Size>
<Style_Checkbox>false</Style_Checkbox>
<TooltipReference>Open LFG Window</TooltipReference>
<ButtonDrawTemplate>
<Normal>A_LFGBtnNormal</Normal>
<Pressed>A_LFGBtnPressed</Pressed>
<Flyby>A_LFGBtnFlyby</Flyby>
<Disabled>A_LFGBtnNormal</Disabled>
<PressedFlyby>A_LFGBtnPressedFlyby</PressedFlyby>
</ButtonDrawTemplate>
</Button>
-->
<!--
<Pieces>GW_LFGButton</Pieces>
-->
Hope this helps. I also Have your files and as soon as I get some time I'll look them over for you, ATM helping a guildie get what he needs into my UI, before we take on Myong.