Set HAL-Pin Values by Python Script

#!/usr/bin/env python
import gtk
import os
import hal
import hal_glib
import linuxcnc

class HandlerClass:

	def __init__(self, halcomp, builder, useropts):
		
		self.halcomp = halcomp
		self.builder = builder
#generate Hal Pin
		self.SPMCLAMP = hal_glib.GPin(halcomp.newpin('USR_SPMCLAMP', hal.HAL_BIT, hal.HAL_OUT))

#generate Button Click Event
		self.BTN_SPMUNCLAMP_auto = self.builder.get_object('BTN_SPMUNCLAMP_auto')
		self.BTN_SPMUNCLAMP_auto.connect("clicked", self._on_BTN_SPMUNCLAMP_auto_clicked)

	def _on_BTN_SPMCLAMP_auto_clicked(self, event) :
		print "Method is activ"				#work
		SPMCLAMP = True				#Dont`t work (No effekt)
		SPMCLAMP.set_active(True)			#Dont`t work (Error)
		SPMCLAMP.set_value(True)			#Dont`t work (Error)

def _on_BTN_SPMCLAMP_auto_clicked(self, pin_reference) :
    print "Method is activ"          #work
    self.SPMCLAMP.set(True)   # this works with a absolute reference to the pin
    pin_reference.set(True)   # this works with an indirect reference to the pin (uses the pin_reference from the method)

self.Pinname.set(Value)

#!/usr/bin/env python

import gtk
import os
import hal
import hal_glib
import linuxcnc

class HandlerClass:

	def __init__(self, halcomp, builder, useropts):

#import objects from Glade File
		self.USR_Liststore = self.builder.get_object('USR_Liststore')
		self.USR_Treeview = self.builder.get_object('USR_Treeview')

#create Hal Pin
		self.HAL_selectedrow = hal_glib.GPin(halcomp.newpin('Test', hal.HAL_S32, hal.HAL_OUT))

#create Event Handler
		USR_Treeview_Select = self.USR_Treeview.get_selection()
		USR_Treeview_Select.connect("changed", self._on_USR_Treeview_selection_change)
		
#Global Variables
	selecteditem = 0

#Event Handler
	def _on_USR_Treeview_selection_change(self, tree_selection):
		model, treeiter = tree_selection.get_selected()
		if treeiter is not None :					# if any row is selected
			self.selecteditem = model[treeiter][0]	
			self.HAL_selectedrow.set(self.USR_Liststore[self.selecteditem][0])
		
#boiler code
def get_handlers(halcomp,builder,useropts):
	return [HandlerClass(halcomp,builder,useropts)]