You can define the 'content' property, let it display buttons on the bottom.
<style type="text/css">
.f-column{
display: flex;
flex-direction: column;
position: relative;
}
.f-full{
flex: 1 1 auto;
}
</style>
$('body').desktop({
apps: [{
name: 'Computer',
icon: 'images/computer.png',
width: 800,
height: 400,
left: 200,
top: 50,
bodyCls: 'panel-noscroll',
content: '<div class="f-column cc" style="height:100%"><div class="f-full"></div><div class="dialog-button"><a href="javascript:;" class="easyui-linkbutton">Button</a></div></div>'
...
});
$.parser.parse('.cc')