Eto ProgressBar multi thread

Hello, i have a question, can i have a progress bar eto who show the progress of a function who make a task in Rhino. Eg: I have this code, who count from 0 to 10 every second in a eto, why the eto don’t show?

import Rhino.UI
import Eto.Drawing as drawing
import Eto.Forms as forms
import time

class progressBar(forms.Dialog):
    def __init__(self,title,textp):
        self.Title = title
        self.ClientSize = drawing.Size(300, 33)
        self.Padding = drawing.Padding(5)
        self.Resizable = False
        self.main_lay = forms.PixelLayout()
        self.progress = forms.ProgressBar()
        self.progress.Size = drawing.Size(290,20)
        self.progress.MinValue = 0
        self.progress.MaxValue = 10
        self.textp = textp
        self.label = forms.Label()
        self.label.Text = self.textp+" "+str(0)+"/"+str(10)
        self.Content = self.main_lay
        for i in range(0,10):
            print i
            self.progress.Value = self.progress.Value +1
            self.label.Text = self.textp+" "+str(self.progress.Value)+"/"+str(10)
dialog = progressBar("Process","Gathering data")