<fxlayout>

  <page name="Linear Gradient">

     <control>period</control>

     <control>color1</control>

     <control>color2</control>

     <rgb_link_button>color1 color2</rgb_link_button>

<separator label="Distortion Wave"/>

     <control>wave_amplitude</control>

     <control>wave_frequency</control>

     <control>wave_phase</control>

  </page>

</fxlayout>