SpeedControl widget 100% [solved]

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

class HandlerClass:

    def on_btn_feed_100_clicked(self,data=None):
        self.extr_scale.set_value(float(100))                 # set the widget value to 100
        self.extr_scale.queue_draw()                            # force a widget redraw

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

        # hal pin with change callback.
        # When the pin's value changes the callback is executed.

        self.extr_scale = self.builder.get_object('extr_scale')
        self.btn_feed_100 = self.builder.get_object('btn_feed_100')
        
def get_handlers(halcomp,builder,useropts):
    return [HandlerClass(halcomp,builder,useropts)]