aseprite/data/widgets/canvas_size.xml

<!-- ASEPRITE -->
<!-- Copyright (C) 2001-2015 by David Capello -->
<gui>
 <window text="Canvas Size" id="canvas_size">
  <vbox>
    <separator text="Size:" left="true" horizontal="true" />
    <hbox>
      <grid columns="2">
        <label text="Width:" />
        <entry text="0" id="width" maxsize="32" maxwidth="64" suffix="px" magnet="true" />
        <label text="Height:" />
        <entry text="0" id="height" maxsize="32" maxwidth="64" suffix="px" />
        <hbox filler="true" cell_hspan="2" />
      </grid>
      <buttonset columns="3" id="dir">
        <item icon="canvas_nw" />
        <item icon="canvas_n" />
        <item icon="canvas_ne" />
        <item icon="canvas_w" />
        <item icon="canvas_c" />
        <item icon="canvas_e" />
        <item icon="canvas_sw" />
        <item icon="canvas_s" />
        <item icon="canvas_se" />
      </buttonset>
    </hbox>

    <separator text="Borders:" left="true" horizontal="true" />
    <grid columns="4">
      <label text="Left:" />
      <entry text="0" id="left" maxsize="32" maxwidth="64" suffix="px" tooltip="Columns to be added/removed in the left side.&#10;Use a negative number to remove columns." />

      <label text="Top:" />
      <entry text="0" id="top" maxsize="32" maxwidth="64" suffix="px" tooltip="Rows to be added/removed in the top side.&#10;Use a negative number to remove rows." />

      <label text="Right:" />
      <entry text="0" id="right" maxsize="32" maxwidth="64" suffix="px" tooltip="Columns to be added/removed in the right side.&#10;Use a negative number to remove columns." />

      <label text="Bottom:" />
      <entry text="0" id="bottom" maxsize="32" maxwidth="64" suffix="px" tooltip="Rows to be added/removed in the bottom side.&#10;Use a negative number to remove rows." />
    </grid>

    <separator horizontal="true" />
    <hbox>
      <boxfiller />
      <hbox homogeneous="true">
        <button text="&amp;OK" closewindow="true" id="ok" magnet="true" width="60" />
        <button text="&amp;Cancel" closewindow="true" />
      </hbox>
    </hbox>
  </vbox>
 </window>
</gui>