aseprite/data/widgets/tools_configuration.xml

<!-- ASEPRITE -->
<!-- Copyright (C) 2001-2012 by David Capello -->
<gui>
<window text="Tools Configuration" id="configure_tool">
  <box vertical="true" childspacing="0">
    <box horizontal="true" expansive="true">
      <box vertical="true" childspacing="2">
        <box horizontal="true" childspacing="0">
            <check text="Tiled" id="tiled" />
            <check text="x" id="tiled_x" />
            <check text="y" id="tiled_y" />
        </box>
        <check text="Onionskin" id="onionskin" />
        <separator text="Grid:" horizontal="true" left="true" />
        <check text="Snap to Grid" id="snap_to_grid" />
        <check text="View Grid" id="view_grid" />
        <check text="Pixel Grid" id="pixel_grid" />
        <button text="Set &amp;Grid" id="set_grid" />
      </box>
      <separator vertical="true" />
      <box vertical="true" expansive="true" childspacing="2">
        <box horizontal="true">
          <grid columns="2" childspacing="0" expansive="true">

            <label text="Pen:" />
            <box horizontal="true" childspacing="0" id="brush_type_box" /><!-- custom widget -->

            <label text="Size:" />
            <slider min="1" max="32" id="brush_size" minwidth="32" cell_align="horizontal" />

            <label text="Angle:" />
            <slider min="0" max="180" id="brush_angle" cell_align="horizontal" />

            <label text="Opacity:" id="opacity_label" />
            <slider min="0" max="255" id="opacity" cell_align="horizontal" />

            <label text="Tolerance:" id="tolerance_label" />
            <slider min="0" max="255" id="tolerance" cell_align="horizontal" />

          </grid>
          <box id="brush_preview_box" /><!-- custom widget -->
        </box>
        <box vertical="true" id="spray_box">
          <separator text="Spray:" horizontal="true" left="true" />
          <box horizontal="true">
            <box vertical="true" homogeneous="true" childspacing="0">
              <label text="Spray Width:" />
              <label text="Air Speed:" />
            </box>
            <box vertical="true" homogeneous="true" expansive="true" childspacing="0">
              <slider min="1" max="32" id="spray_width" />
              <slider min="1" max="100" id="air_speed" />
            </box>
          </box>
        </box>
      </box>
    </box>
  </box>
</window>
</gui>