Window shows up perfectly (apart from that button).
I firstly didn't want to post the window's code because it's pretty long :P
code:
<?xml version="1.0" encoding="Unicode"?>
<Interfaces xmlns="urn:msgplus:interface" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="urn:msgplus:interface PlusInterface.xsd">
<Window Id="WndMain_Options" Version="1">
<Position ClientWidth="200" ClientHeight="117"/>
<InitialPos>CenteredScreen</InitialPos>
<Controls>
<Control xsi:type="StaticControl" Id="LblOptions">
<Position Left="10" Top="0" Width="200" Height="20"/>
<Color>
<Red>54</Red>
<Green>94</Green>
<Blue>145</Blue>
</Color>
<Font>
<Size>14</Size>
</Font>
<Caption>LblOptions</Caption>
</Control>
<Control xsi:type="CheckBoxControl" Id="ChkAutoUpd">
<Position Left="10" Top="20" Width="180"/>
<Caption>Automatically check for updates</Caption>
</Control>
<Control xsi:type="CheckBoxControl" Id="ChkSP">
<Position Left="10" Top="30" Width="180"/>
<Caption>I have StuffPlug (used for some extras)</Caption>
</Control>
<Control xsi:type="CheckBoxControl" Id="ChkNotif">
<Position Left="10" Top="40" Width="180"/>
<Caption>Receive notifications about my other work</Caption>
</Control>
<Control xsi:type="CheckBoxControl" Id="ChkSDev">
<Position Left="10" Top="50" Width="180"/>
<Caption>Register as developer</Caption>
</Control>
<Control xsi:type="StaticControl" Id="LblExtCommandPrefix">
<Position Left="10" Top="60" Width="180"/>
<Caption>External commands prefix:</Caption>
</Control>
<Control xsi:type="EditControl" Id="EdtExtCommandPrefix">
<Position Left="10" Top="70" Width="20" Height="11"/>
</Control>
<Control xsi:type="LinkControl" Id="LnkLanguage">
<Position Left="10" Top="86" Width="120" Height="11"/>
<Caption>Choose language</Caption>
<Attributes>
<UnderLine>WhenHot</UnderLine>
</Attributes>
<TextColor>
<Red>0</Red>
<Green>0</Green>
<Blue>255</Blue>
</TextColor>
<HotTextColor>
<Red>128</Red>
<Green>0</Green>
<Blue>255</Blue>
</HotTextColor>
</Control>
<Control xsi:type="ButtonControl" Id="BtnNextPage">
<Position Left="100" Top="70" Width="5" />
<Caption>></Caption>
</Control>
</Controls>
<ChildTmpl/>
</Window>
</Interfaces>
EDIT:: ha that's the old version
/ 
