First, you can have the delete icon with css :
In the zip file, you have an example. And here is a copy :
.input-delete{ width: 16px; height: 16px; background: url('../../../manager/media/style/MODx/images/icons/delete.png') no-repeat 0 0; text-decoration: none; border: none;float:right; }
Just make sure the number of ’..’ correspond to the place you put the css file

It’s just to find the icon already existing in the modx install.
The delete icon is already there, you don’t have anything to do more

For progress bar, I have never looked at that, I’ve just changed the background and the color, so it’s just css. I suppose it could be done with some mootools JS addon