How to use the pyface.image_resource.ImageResource function in pyface

snippets = List(CodeItem)

    # The list of visible code items for the lab:
    visible_snippets = Property(depends_on='visible', cached=True)

    # The currently selected snippet:
    snippet = Instance(CodeItem)

    # Should normally hidden code items be shown?
    visible = Bool(False)

    # The dictionary containing the items from the Python code execution:
    values = Dict  # Any( {} )

    # The run Python code button:
    run = Button(image=ImageResource('run'), height_padding=1)

    # User error message:
    message = Str

    # The output produced while the program is running:
    output = Str

    # The current demo pane (if any):
    demo = Instance(DemoPane, ())

    #-- Traits View Definitions ----------------------------------------------

    view = View(
        VSplit(
            VGroup(
                Item('visible_snippets',

def _get_image(self, image):
        """ Converts a user specified image to a QIcon.
        """
        if isinstance(image, basestring):
            self.image = image
            image = self.image

        if isinstance(image, ImageResource):
            result = self.image_resources.get(image)
            if result is not None:
                return result
            return self._add_image(image)

        return self.images.get(image)

from pyface.i_application_window import MApplicationWindow
from pyface.image_resource import ImageResource


from .window import Window


@provides(IApplicationWindow)
class ApplicationWindow(MApplicationWindow, Window):
    """ The toolkit specific implementation of an ApplicationWindow.  See the
    IApplicationWindow interface for the API documentation.
    """

    # 'IApplicationWindow' interface ---------------------------------------

    icon = Instance(ImageResource)

    menu_bar_manager = Instance(MenuBarManager)

    status_bar_manager = Instance(StatusBarManager)

    tool_bar_manager = Instance(ToolBarManager)

    # If the underlying toolkit supports multiple toolbars then you can use
    # this list instead.
    tool_bar_managers = List(ToolBarManager)

    # 'IWindow' interface -------------------------------------------------#

    # fixme: We can't set the default value of the actual 'size' trait here as
    # in the toolkit-specific event handlers for window size and position
    # changes, we set the value of the shadow '_size' trait. The problem is

def _sensitivity_group(self):
        im = ImageResource(
            name='database_go.png',
            search_path=paths.icon_search_path)
        beditor = ButtonEditor(image=im)

        grp = VGroup(
            HGroup(
                Item('save_sens', label='Save'),
                UItem('sens_value', ),
                UItem('db_sens_button',
                      style='custom',
                      editor=beditor)),

            label='Sensitivity')

        return grp

layout='tabbed',
            label='Help',
            id='help'
        ),
        layout="tabbed",
        springy=True,
        id="tabs",
    ),
    resizable=False,
    handler=MyHandler(),
    buttons=[run_sim, save_cfg, load_cfg, save_data, load_data],
    statusbar="status_str",
    title="PyBERT",
    width=0.95,
    height=0.9,
    icon=ImageResource("icon.png"),
)

next_section = Property(depends_on='section', cached=True)

    # The previous section:
    previous_section = Property(depends_on='section', cached=True)

    # The previous section button:
    previous = Button(image=ImageResource('previous'), height_padding=1)

    # The next section button:
    next = Button(image=ImageResource('next'), height_padding=1)

    # The parent section button:
    parent = Button(image=ImageResource('parent'), height_padding=1)

    # The reload tutor button:
    reload = Button(image=ImageResource('reload'), height_padding=1)

    # The title of the current session:
    title = Property(depends_on='section')

    #-- Traits View Definitions ----------------------------------------------

    view = View(
        VGroup(
            HGroup(
                Item('previous',
                     style='custom',
                     enabled_when='previous_section is not None',
                     tooltip='Go to previous section'
                     ),
                Item('parent',
                     style='custom',

if decorated:
                webbrowser.open(url, autoraise=1)
            else:
                firefox = webbrowser.get('firefox')
                firefox._invoke(['-chrome', url], remote=False, autoraise=True)
        else:
            webbrowser.open(url, autoraise=1)


class Bugfix(Action):
    """ An action that pop up the bugfix GitHub page in a browser. """

    name = "Bugfixes"
    tooltip       = "Bug Fixes ..."
    description   = "Bug Fixes ..."
    image = ImageResource("bug.png", search_path=[IMAGE_PATH])

    ###########################################################################
    # 'Action' interface.
    ###########################################################################

    def perform(self, event):
        """ Performs the action. """
        browser_open(url='http://github.com/LTS5/connectomeviewer/issues', decorated = True)

class Keybindings(Action):
    """ An action that creates a temporary html file to show the key bindings.. """

    name = "Key Bindings"
    tooltip       = "Show Key Bindings in Browser"
    description   = "Key Bindings"
    image = ImageResource("keyboard.png", search_path=[IMAGE_PATH])

path = Directory

    # The root of the tutorial lesson tree:
    root = Instance(ASection)

    # The current section of the tutorial being displayed:
    section = Instance(ASection)

    # The next section:
    next_section = Property(depends_on='section', cached=True)

    # The previous section:
    previous_section = Property(depends_on='section', cached=True)

    # The previous section button:
    previous = Button(image=ImageResource('previous'), height_padding=1)

    # The next section button:
    next = Button(image=ImageResource('next'), height_padding=1)

    # The parent section button:
    parent = Button(image=ImageResource('parent'), height_padding=1)

    # The reload tutor button:
    reload = Button(image=ImageResource('reload'), height_padding=1)

    # The title of the current session:
    title = Property(depends_on='section')

    #-- Traits View Definitions ----------------------------------------------

    view = View(

def _get_big_image(self):
        size = self.item.size
        if size > 65536:
            return ImageResource('red_ball')

        return (None, ImageResource('blue_ball'))[size > 16384]