nuke panel test

main.ui

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>Form</class>
 <widget class="QWidget" name="Form">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>961</width>
    <height>651</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>Form</string>
  </property>
  <layout class="QGridLayout" name="gridLayout">
   <item row="0" column="0">
    <layout class="QVBoxLayout" name="verticalLayout">
     <item>
      <widget class="QPushButton" name="pushButton">
       <property name="text">
        <string>PushButton</string>
       </property>
      </widget>
     </item>
    </layout>
   </item>
  </layout>
 </widget>
 <resources/>
 <connections/>
</ui>

panel.py

from PySide import QtGui
from PySide import QtUiTools

import nuke
import nukescripts

WINDOW_TITLE = 'Boilerplate'
WINDOW_OBJECT = 'boilerPlate'
UI_DIR = 'C:/Users/fredrik/Desktop'

class Boilerplate(QtGui.QWidget):
    def __init__(self, parent=None):
        super(Boilerplate, self).__init__()

        # Filepaths
        main_window_file = os.path.join(UI_DIR, 'main.ui')
        module_file = os.path.join(UI_DIR, 'module.ui')

        # Load UIs
        self.ui = QtUiTools.QUiLoader().load(main_window_file)  # Main window
        self.ui.module = QtUiTools.QUiLoader().load(module_file)  # Module

        # Set object name and window title
        self.ui.setObjectName(WINDOW_OBJECT)
        self.ui.setWindowTitle(WINDOW_TITLE)

        # Attach module to main window
        self.ui.verticalLayout.addWidget(self.ui.module)


# Just show the UI
# window = Boilerplate()
# window.ui.show()

# Register the UI as a panel
panel = nukescripts.panels.registerWidgetAsPanel('Boilerplate', 'Test panel', 'uk.co.thefoundry.Boilerplate' )
pane = nuke.getPaneFor('Properties.1')
panel.addToPane(pane)