yada

<?xml version="1.0"?>
<element>
    <attribute name="Name" value="PlayerWindowUIElement" />
    <attribute name="Size" value="640 400" />
    <attribute name="Opacity" value="0.5" />
    <attribute name="Is Enabled" value="true" />
    <attribute name="Bring To Front" value="true" />
    <attribute name="Focus Mode" value="Focusable" />
    <element type="Window">
        <attribute name="Size" value="640 400" />
        <attribute name="Texture" value="Texture2D;Textures/Buttons/darkgrey.png" />
        <attribute name="Is Movable" value="true" />
        <attribute name="Is Resizable" value="true" />
        <element type="Button" style="CloseButton">
            <attribute name="Name" value="closeButton" />
            <attribute name="Priority" value="1" />
            <attribute name="Focus Mode" value="Focusable" />
        </element>
        <element type="Text">
            <attribute name="Position" value="100 100" />
            <attribute name="Priority" value="2" />
            <attribute name="Top Left Color" value="0.85 0.85 0.85 1" />
            <attribute name="Top Right Color" value="0.85 0.85 0.85 1" />
            <attribute name="Bottom Left Color" value="0.85 0.85 0.85 1" />
            <attribute name="Bottom Right Color" value="0.85 0.85 0.85 1" />
            <attribute name="Is Enabled" value="true" />
            <attribute name="Use Derived Opacity" value="true" />
            <attribute name="Text" value="testing" />
        </element>
    </element>
</element>