QtView style sheet not taken into account with kind='modal'

Using this code:

from traits.api import HasTraits, Int, Instance
from traitsui.qt4.extra.qt_view import QtView

class A(HasTraits):
a = Int

class B(HasTraits):
b = Instance(A,())

b = B()

b.configure_traits(view = QtView('b', style_sheet='font: 18pt "Verdana"'))

the style sheet is used. If the last line is changed to

b.configure_traits(view = QtView('b', style_sheet='font: 18pt "Verdana"'), kind='modal')

it is not.

I could fix this by changing and renaming **ui** in traitsui\qt4\extra\qt_view.py:

def ui(self, context, parent=None, kind=None, view_elements=None,
handler=None, id='', scrollable=None, args=None):

ui = super(QtView, self).ui(context, parent, kind, view_elements,
handler, id, scrollable, args)

if self.style_sheet:
ui.control.setStyleSheet(self.style_sheet)

if self.style_sheet_path:
try:
with open(self.style_sheet_path, 'r') as f:
ui.control.setStyleSheet(f.read())
except IOError:
logger.exception("Error loading Qt style sheet")

if len(self.tab_order) >= 2:
previous = self._get_editor_control(ui, self.tab_order[0])
for i in xrange(1, len(self.tab_order)):
current = self._get_editor_control(ui, self.tab_order[i])
QtGui.QWidget.setTabOrder(previous, current)
previous = current
return ui

to the following:

def _use_style_sheet(self, ui): # changed the name
# The rest is the same except the call to superclass' ui
if self.style_sheet:
ui.control.setStyleSheet(self.style_sheet)

if self.style_sheet_path:
try:
with open(self.style_sheet_path, 'r') as f:
ui.control.setStyleSheet(f.read())
except IOError:
logger.exception("Error loading Qt style sheet")

if len(self.tab_order) >= 2:
previous = self._get_editor_control(ui, self.tab_order[0])
for i in xrange(1, len(self.tab_order)):
current = self._get_editor_control(ui, self.tab_order[i])
QtGui.QWidget.setTabOrder(previous, current)
previous = current

and by changing the first lines of **display_ui** in traitsui\qt4\ui_base.py :

@staticmethod
def display_ui(ui, parent, style):
"""Display the UI."""

ui.owner.init(ui, parent, style)
ui.control = ui.owner.control
ui.control._parent = parent

if hasattr(ui.view,'style_sheet'): # added
ui.view._use_style_sheet(ui) # added
....