icon_test.enaml

from enaml.layout.api import (
    hbox, vbox, align, spacer,
)
from enaml.widgets.api import (
    MainWindow, PushButton, ImageView, Container
)
import enaml
import os

def openResource(path, mode='r'):
    dirname = '.'
    return open(os.path.join(dirname,path), mode=mode)

def loadImage(filename):
    with openResource(filename, 'rb') as f:
        data = f.read()
        return enaml.image.Image(data=data)

def loadIcon(filename):
    image = loadImage(filename)
    return enaml.icon.Icon(images=[enaml.icon.IconImage(image=image)])

ICONS = {
    'tr-A'   : loadIcon('tr-a.png'),
    'tr-B'   : loadIcon('tr-b.png'),
    'tr-C'   : loadIcon('tr-c.png'),
}

enamldef Main(MainWindow): main:
    Container:
        constraints << [
            vbox(
                 hbox(btnTrA, btnTrB, btnTrC, spacer),
                 spacer
            ),
        ]
        PushButton: btnTrA:
            icon = ICONS['tr-A']
            clicked ::
                print "A"
        PushButton: btnTrB:
            icon = ICONS['tr-B']
            clicked ::
                print "B"
        PushButton: btnTrC:
            icon = ICONS['tr-C']
            clicked ::
                print "C"

tr-a.png

tr-b.png

tr-c.png