Thanks for posting that Cookie! I forgot to!
Here is something else you can do:
Spoiler:
xml code:
<?xml version="1.0" encoding="UTF-16"?>
<Interfaces xmlns="urn:msgplus:interface" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="urn:msgplus:interface PlusInterface.xsd">
<GlobalColors>
<GlobalColor Id="bg">
<BaseColor>
<Saturation>2</Saturation>
<Brightness>0.6</Brightness>
<Transparency>45</Transparency>
</BaseColor>
</GlobalColor>
<GlobalColor Id="ref">
<BaseColor>
<Saturation>2.5</Saturation>
<Brightness>0.8</Brightness>
<Transparency>220</Transparency>
</BaseColor>
</GlobalColor>
</GlobalColors>
<Window Id="Test" Version="1">
<Position Width="354" Height="250" />
<DialogTmpl />
<Elements>
<Element xsi:type="FigureElement" Id="Fig1">
<Position Top="0" Left="0" />
<Figure>
<Custom>
<PathChunk xsi:type="LineChunk">
<X1>500</X1>
<Y1>100</Y1>
<X2>40</X2>
<Y2>150</Y2>
</PathChunk>
<PathChunk xsi:type="BezierChunk">
<X1>100</X1>
<Y1>100</Y1>
<X2>220</X2>
<Y2>120</Y2>
<X3>270</X3>
<Y3>270</Y3>
<X4>120</X4>
<Y4>320</Y4>
</PathChunk>
</Custom>
</Figure>
<Fill>
<LinearGradient Angle="45">
<Color1>
<GlobalColor>ref</GlobalColor>
</Color1>
<Color2>
<GlobalColor>bg</GlobalColor>
</Color2>
</LinearGradient>
</Fill>
</Element>
</Elements>
</Window>
</Interfaces>