There is a way to change wpf components without freezing the gui with ironpython 2.7?

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Visual-Studio

WPF

IronPython

So, I'm trying to make some function run without freezing the GUI. There is some way to change the text from a textblock in another thread? For example:

import wpf
import thread

from System.Windows import Application, Window

class MyWindow(Window):
    def __init__(self):
        wpf.LoadComponent(self, 'WpfApplication2.xaml')

    def setText(self):
        self.textblock.Text = "Hiiii!"

    def button_Click(self, sender, e):
        thread.start_new_thread(self.setText,())

if __name__ == '__main__':
    Application().Run(MyWindow())

and my wpf:

<Window 
       xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
       xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
       Title="WpfApplication2" Height="300" Width="300"> 
       <Grid>
           <TextBlock x:Name="textblock" Text="Oi" VerticalAlignment="Center" HorizontalAlignment="Center" FontWeight="Bold" FontSize="32" TextAlignment="Center" />
        <Button x:Name="button" Content="Change" HorizontalAlignment="Center" VerticalAlignment="Bottom" Width="100" Height="50" Click="button_Click"/>

    </Grid>
</Window> 

I can't in any way that I try, to change the text block in another thread. There is no way to make, for example, a infinite while loop to update data, without freezing the GUI?