<fxlayout>
  <page name="HSV Key">
    <control>h</control>
    <control>s</control>
    <control>v</control>
    <control>h_range</control>
    <control>s_range</control>
    <control>v_range</control>
    <control>invert</control>
  </page>
 
 
</fxlayout>