hide_show_button.xml

<!DOCTYPE template>
<!--
  Description:
    A hide/show button.
  Variables:
    group: The group for the controls.
-->
<Template>
  <PushButton>
    <ObjectName><Variable name="object_name"/></ObjectName>
    <Size>20f,20f</Size>
    <NumberStates>2</NumberStates>
    <State>
      <Number>0</Number>
      <Text></Text>
      <Pressed scalemode="STRETCH_ASPECT">icon/ic_unfold_more_48px.svg</Pressed>
      <Unpressed scalemode="STRETCH_ASPECT">icon/ic_unfold_more_48px.svg</Unpressed>
    </State>
    <State>
      <Number>1</Number>
      <Text></Text>
      <Pressed scalemode="STRETCH_ASPECT">icon/ic_unfold_less_48px.svg</Pressed>
      <Unpressed scalemode="STRETCH_ASPECT">icon/ic_unfold_less_48px.svg</Unpressed>
    </State>
    <Connection>
      <ConfigKey><Variable name="control"/></ConfigKey>
      <EmitOnPressAndRelease>true</EmitOnPressAndRelease>
      <ButtonState>LeftButton</ButtonState>
    </Connection>
  </PushButton>
</Template>