I know it doesn't have any buttons, but this is what I have tried:
xml code:
<Window Id="WndSearch" Version="1">
<Position Width="400" Height="150"/>
<ChildTmpl>
<Controls>
<Control xsi:type="StaticControl" Id="InfoTxt">
<Position Left="8" Top="3" Width="370"/>
<Caption>Enter the text to search for, and click Search to open a results window.</Caption>
</Control>
<Control xsi:type="EditControl" Id="EdtSearch">
<Position Left="8" Top="23" Width="370"/>
<Help>Enter a search query...</Help>
</Control>
</Controls>
</Window>
I have also tried using the exact window mentioned above:
xml code:
<Window Id="WndChildExample" Version="1">
<ChildTmpl/>
<Position Width="243" Height="193"/>
<Controls>
<Control xsi:type="StaticControl" Id="lblTitle">
<Position Top="25" Width="100" Left="15" Height="15" />
<Caption>hi I am a child window :)</Caption>
</Control>
</Controls>
</Window>