How to use the pydm.widgets.PyDMPushButton function in pydm

if self._cmd.arg:
            self._path += '/True'

            if self._cmd.disp == 'enum' and self._cmd.enum is not None and self._cmd.mode != 'RO':
                w = PyDMEnumComboBox(parent=None, init_channel=self._path)
                w.alarmSensitiveContent = False
                w.alarmSensitiveBorder  = False
            else:
                w = PyDMLineEdit(parent=None, init_channel=self._path)
                w.showUnits             = False
                w.precisionFromPV       = True
                w.alarmSensitiveContent = False
                w.alarmSensitiveBorder  = False
        else:
            w = PyDMPushButton(label='Exec',pressValue=1,init_channel=self._path)

        self._top._tree.setItemWidget(self,2,w)

self._loadConfigValue = QLineEdit()
        self._loadConfigValue.textChanged.connect(self._loadConfigChanged)
        hb.addWidget(self._loadConfigValue)

        pb = QPushButton('Browse')
        pb.clicked.connect(self._loadConfigBrowse)
        hb.addWidget(pb)

        # Save Config
        # This needs to be changed to the new pydm command interface with the push
        # button commiting the line edit value
        hb = QHBoxLayout()
        vb.addLayout(hb)

        self._saveConfigCmd = PyDMPushButton(label='Save Config',
                                             pressValue='',
                                             init_channel=self._path + '.SaveConfig')

        hb.addWidget(self._saveConfigCmd)

        self._saveConfigValue = QLineEdit()
        self._saveConfigValue.textChanged.connect(self._saveConfigChanged)
        hb.addWidget(self._saveConfigValue)

        pb = QPushButton('Browse')
        pb.clicked.connect(self._saveConfigBrowse)
        hb.addWidget(pb)

        # Save State
        # This needs to be changed to the new pydm command interface with the push
        # button commiting the line edit value

fl.setLabelAlignment(Qt.AlignRight)
        vb.addLayout(fl)

        self._dataFile = PyDMLineEdit(parent=None, init_channel=self._path + '.DataFile')
        self._dataFile.alarmSensitiveContent = False
        self._dataFile.alarmSensitiveBorder  = True
        fl.addRow('Data File:',self._dataFile)

        hb = QHBoxLayout()
        vb.addLayout(hb)

        pb = QPushButton('Browse')
        pb.clicked.connect(self._browse)
        hb.addWidget(pb)

        w = PyDMPushButton(label='Auto Name',pressValue=1,init_channel=self._path + '.AutoName')
        hb.addWidget(w)

        w = PyDMPushButton(label='Open',pressValue=1,init_channel=self._path + '.Open')
        hb.addWidget(w)

        w = PyDMPushButton(label='Close',pressValue=1,init_channel=self._path + '.Close')
        hb.addWidget(w)

        hb = QHBoxLayout()
        vb.addLayout(hb)

        vbl = QVBoxLayout()
        hb.addLayout(vbl)

        fl = QFormLayout()
        fl.setRowWrapPolicy(QFormLayout.DontWrapRows)

self._saveConfigValue = QLineEdit()
        self._saveConfigValue.textChanged.connect(self._saveConfigChanged)
        hb.addWidget(self._saveConfigValue)

        pb = QPushButton('Browse')
        pb.clicked.connect(self._saveConfigBrowse)
        hb.addWidget(pb)

        # Save State
        # This needs to be changed to the new pydm command interface with the push
        # button commiting the line edit value
        hb = QHBoxLayout()
        vb.addLayout(hb)

        self._saveStateCmd = PyDMPushButton(label='Save State ',
                                            pressValue='',
                                            init_channel=self._path + '.SaveState')

        hb.addWidget(self._saveStateCmd)

        self._saveStateValue = QLineEdit()
        self._saveStateValue.textChanged.connect(self._saveStateChanged)
        hb.addWidget(self._saveStateValue)

        pb = QPushButton('Browse')
        pb.clicked.connect(self._saveStateBrowse)
        hb.addWidget(pb)

self._tree.setHeaderLabels(['Variable','Mode','Type','Value','Units'])

        self._tree.setContextMenuPolicy(Qt.CustomContextMenu)
        self._tree.customContextMenuRequested.connect(self._openMenu)

        self._tree.itemExpanded.connect(self._expandCb)

        hb = QHBoxLayout()
        vb.addLayout(hb)

        if self._node == self._client.root:
            chan = 'rogue://{}:{}/root.ReadAll'.format(self._addr,self._port)
        else:
            chan = 'rogue://{}:{}/{}.ReadDevice'.format(self._addr,self._port,self._node.path)

        pb = PyDMPushButton(label='Read',pressValue=1,init_channel=chan)

        hb.addWidget(pb)

        self._children.append(VariableDev(top=self, parent=self._tree, dev=self._node, noExpand=False))

w = PyDMLabel(parent=None, init_channel=self._path + '/name')
        w.showUnits             = False
        w.precisionFromPV       = False
        w.alarmSensitiveContent = False
        w.alarmSensitiveBorder  = True

        self._top._tree.setItemWidget(self,0,w)
        self.setToolTip(0,self._cmd.description)

        self.setText(1,self._cmd.typeStr)

        # This needs to be changed when pydm is updated. In the future the primary
        # channel interface will be the input widget, with the button generating a
        # update of the channel.
        self._btn = PyDMPushButton(label='Exec',
                                   pressValue=self._value,
                                   init_channel=self._path + '/disp')
        self._btn.setToolTip(self._cmd.description)

        self._top._tree.setItemWidget(self,2,self._btn)

        if self._cmd.arg:

            if self._cmd.disp == 'enum' and self._cmd.enum is not None:
                self._widget = QComboBox()
                for i in self._cmd.enum:
                    self._widget.addItem(self._cmd.enum[i])

                self._value = self._cmd.valueDisp()
                self._widget.setCurrentIndex(self._widget.findText(self._value))
                self._widget.setToolTip(self._cmd.description)

gb = QGroupBox('System Log')
        vb.addWidget(gb)

        vb = QVBoxLayout()
        gb.setLayout(vb)

        self._systemLog = QTreeWidget()
        vb.addWidget(self._systemLog)

        self._systemLog.setColumnCount(2)
        self._systemLog.setHeaderLabels(['Field','Value'])

        self._logCount = 0

        self._pb = PyDMPushButton(label='Clear Log',pressValue=1,init_channel=cpath)
        vb.addWidget(self._pb)

vb = QVBoxLayout()
        self.setLayout(vb)

        self._tree = QTreeWidget()
        vb.addWidget(self._tree)

        self._tree.setColumnCount(5)
        self._tree.setHeaderLabels(['Variable','Mode','Type','Value','Units'])

        self._tree.itemExpanded.connect(self._expandCb)

        hb = QHBoxLayout()
        vb.addLayout(hb)

        if self._node.isinstance(pyrogue.Root):
            hb.addWidget(PyDMPushButton(label='Read All',
                                        pressValue=True,
                                        init_channel=self._path + '.ReadAll'))
        else:
            hb.addWidget(PyDMPushButton(label='Read Recursive',
                                        pressValue=True,
                                        init_channel=self._path + '.ReadDevice'))


        self.setUpdatesEnabled(False)
        VariableDev(path = self._path, top=self, parent=self._tree, dev=self._node, noExpand=False)
        self.setUpdatesEnabled(True)