aseprite/data/widgets/palette_from_sprite.xml

<!-- Aseprite -->
<!-- Copyright (C) 2015-2018 by David Capello -->
<gui>
<window id="palette_from_sprite" text="@.title">
  <grid columns="2">
    <radio id="new_palette" text="@.new_palette" group="1" />
    <expr expansive="true" id="ncolors" magnet="true" />
    <radio id="current_palette" text="@.replace_palette" group="1" cell_hspan="2" />
    <radio id="current_range" text="@.replace_range" group="1" cell_hspan="2" />
    <check id="alpha_channel" text="@.alpha_channel" cell_hspan="2" />

    <separator horizontal="true" cell_hspan="2" />

    <box horizontal="true" homogeneous="true" cell_hspan="2" cell_align="right">
      <button text="@general.ok" closewindow="true" id="ok" magnet="true" minwidth="60" />
      <button text="@general.cancel" closewindow="true" />
    </box>
  </grid>
</window>
</gui>