aseprite/data/widgets/modify_selection.xml

<!-- Aseprite -->
<!-- Copyright (C) 2015 by David Capello -->
<gui>
<window id="modify_selection" text="Modify Selection">
  <vbox>
    <grid columns="2">

      <label id="by_label" text="By:" />
      <entry id="quantity" expansive="true" maxsize="4" magnet="true" suffix="px" />

      <hbox />
      <vbox>
        <radio id="circle" text="Circle Brush" group="1" />
        <radio id="square" text="Square Brush" group="1" />
      </vbox>

    </grid>
    <separator horizontal="true" cell_hspan="3" />
    <hbox homogeneous="true" cell_hspan="3" cell_align="right">
      <button text="&amp;OK" closewindow="true" id="ok" magnet="true" minwidth="60" />
      <button text="&amp;Cancel" closewindow="true" />
    </hbox>
  </vbox>
</window>
</gui>