WPF Can´t change content of label by databinding

Czechtim

Hello, I have problem with databinding. I created small application using structure that I need to demonstrate problem.
I need to change content of label when changing content of property "Promena". I change content of property "Promena" from "Origin text" to "Changed text" using thread but content of label is still the same - databinding isn´t working according to my vision.
Does somebody know, please, why content of label doesn´t change when I change content of property "Promena"?

test.xaml

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 <Window x:Class="DispatcherTimer_CodeProject.test" 

        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 

        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"   

        xmlns:src="clr-namespace:DispatcherTimer_CodeProject" 

        x:Name="myDispatcherTimer" 

        Title="DispatcherTimer" 

        WindowStyle="None" 

        WindowState="Maximized" 

        ResizeMode="NoResize">  
 
    <Window.Resources>    

        <src:test x:Key="prevod"/>  

        <DataTemplate x:Key="grid1">  

            <Grid x:Name="myGrid" Background="Blue" Cursor="None">  

                <Grid.RowDefinitions> 

                    <RowDefinition Height="*"/>  

                    <RowDefinition Height="*"/>  

                </Grid.RowDefinitions> 

                <Grid.ColumnDefinitions> 

                    <ColumnDefinition/> 

                </Grid.ColumnDefinitions> 

                <Label Grid.Row="0"    

               Grid.Column="0"    

                       Name="DatumCas2" 

               Content="{Binding Source={StaticResource prevod}, Path=Promena, Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}" 

               VerticalContentAlignment="Center"   

               HorizontalContentAlignment="Center">  

                </Label> 

            </Grid> 

        </DataTemplate> 

        <DataTemplate x:Key="grid2">  

            <Grid x:Name="myGrid" 

          Background="Black" 

          Cursor="None">  

                <Grid.RowDefinitions> 

                    <RowDefinition Height="*"/>  

                    <RowDefinition Height="*"/>  

                </Grid.RowDefinitions> 

                <Grid.ColumnDefinitions> 

                    <ColumnDefinition/> 

                </Grid.ColumnDefinitions> 
 
                <Label Grid.Row="0"   

               Grid.Column="0"   

               Foreground="Red" 

               FontSize="50" 

               Content="CurrentDateAndTime" 

               VerticalContentAlignment="Center" 

               HorizontalContentAlignment="Center">  

                </Label> 

                <Label x:Name="DatumCas" 

               Grid.Row="1" 

               Grid.Column="0" 

               Foreground="White" 

               FontSize="30" 

               VerticalContentAlignment="Top" 

               HorizontalContentAlignment="Center">  

                </Label> 

            </Grid> 

        </DataTemplate> 

    </Window.Resources> 

</Window>

test.xaml.cs

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 using System;  

using System.Windows;  

using System.Windows.Controls;  

using Microsoft.Win32;  

using System.Windows.Input;  

using System.Threading;  

using System.ComponentModel;  

using System.Windows.Threading;  
 
namespace DispatcherTimer_CodeProject  

{  

    public partial class test : Window, INotifyPropertyChanged  

    {     

        public event PropertyChangedEventHandler PropertyChanged;  
 
        private void NotifyPropertyChanged(string info)  

        {  

            if (PropertyChanged != null)  

                PropertyChanged(this, new PropertyChangedEventArgs(info));  

        }  
 
        private string promena;  
 
        public string Promena  

        {  

            get { return promena; }  

            set { promena = value; NotifyPropertyChanged("Promena"); }  

        }  
 
        public test()  

        {  
 
            InitializeComponent();  

            Promena = "Origin text";  

            this.MouseDoubleClick += new System.Windows.Input.MouseButtonEventHandler(test_MouseDoubleClick);  

            this.ContentTemplate = FindResource("grid1") as DataTemplate;  

        }  
 
        void test_MouseDoubleClick(object sender, System.Windows.Input.MouseButtonEventArgs e)  

        {  

           myDispatcherTimer.Close();  

        }  
 
        private void UserControl_Loaded(object sender, RoutedEventArgs e)  

        {  

            System.Threading.Thread t = new Thread(new ThreadStart(Run));  

            t.SetApartmentState(ApartmentState.STA);  

            t.Start();  

        }  
 
        void Run()  

        {  

            Thread.Sleep(2000);  

            Promena  = "Changed text";  

        }  

    }      

}

WPF Can´t change content of label by databinding

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