Q:

Binding a textbox from a secondary window is not updating the property

I need to bind the text property of a textbox that it is located in a secondary window to a property that is defined in the corresponding view model of that secondary window
XAML CODE:
<Window x:Class="RG.IOManager.Views.PreferencesDialog"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:genericClasses="clr-namespace:RG.IOManager.GenericClasses"
    xmlns:xctk="http://schemas.xceed.com/wpf/xaml/toolkit"
    Title="Setup" Height="131" Width="332"
    WindowStartupLocation="CenterOwner" 
    ShowInTaskbar="False"
    WindowStyle="ToolWindow"
    >

<Window.Resources>
    <ResourceDictionary>
        <ResourceDictionary.MergedDictionaries>
            <ResourceDictionary Source="../ResourceDictionary.xaml" />
            <ResourceDictionary Source="../ScrollBarTemplate.xaml" />
            <ResourceDictionary Source="../Styles.xaml" />
        </ResourceDictionary.MergedDictionaries>
    </ResourceDictionary>
</Window.Resources>

<Grid>
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="Auto" />
        <ColumnDefinition Width="Auto" />
        <ColumnDefinition Width="10*" />
    </Grid.ColumnDefinitions>
    <Grid.RowDefinitions>
        <RowDefinition Height="Auto" />
        <RowDefinition Height="Auto" />
    </Grid.RowDefinitions>
    <Label Content="Cycle Time"  Grid.Row="0" Grid.Column="0" Height="28" HorizontalAlignment="Left" Margin="10,10,0,20" Name="label1" VerticalAlignment="Top" />
    <StackPanel Grid.Row="0" Grid.Column="1" Width="190" Orientation="Horizontal">
        <!--
        <xctk:IntegerUpDown  Name="TbMainCycleTime" Margin="10,10,0,20" Width="50" Height="25" HorizontalContentAlignment="Right" 
                             Increment="1" Maximum="5000" Minimum="0" ShowButtonSpinner="False"/>
        -->

        <TextBox Name="TbMainCycleTime" Margin="10,10,0,20" Width="50" Height="25" HorizontalContentAlignment="Right" Validation.ErrorTemplate="{StaticResource ErrorTemplate}" Style="{StaticResource textBoxErrorTooltip}" >
            <TextBox.Text>
                <Binding Source="PreferencesDialog" Path="CycleTime" Mode="TwoWay" UpdateSourceTrigger="PropertyChanged" >
                    <Binding.ValidationRules>
                        <genericClasses:IntegersValidation Min="0" Max="1000" />
                    </Binding.ValidationRules>
                </Binding>
            </TextBox.Text>
        </TextBox>

        <!--<TextBox Name="TbMainCycleTime" Margin="10,10,0,20" Width="50" Height="25" HorizontalContentAlignment="Right"  />-->
        <Label Content="ms" Margin="1,10,10,20"/>
    </StackPanel>
    <StackPanel Grid.Row="1" Grid.Column="1" Width="190" Orientation="Horizontal">
        <Button Content="Update" Height="23" HorizontalAlignment="Left" Margin="5,0,10,0" Name="btUpdate" VerticalAlignment="Top" Width="75" Click="btUpdate_Click" />
        <Button Content="Cancel" Height="23" HorizontalAlignment="Left" Margin="5,0,10,0" Name="btCancel" VerticalAlignment="Top" Width="75" Click="btCancel_Click" />
    </StackPanel>
</Grid>

CS CODE:
/// <summary>
/// Interaction logic for PreferencesDialogue.xaml
/// </summary>
public partial class PreferencesDialog : Window, INotifyPropertyChanged
{
    #region Binding Properties

    public event PropertyChangedEventHandler PropertyChanged;

    /// <summary>
    /// Main cycle time
    /// </summary>
    public int CycleTime
    {
        get { return _CycleTime; }
        set
        {
            _CycleTime = value;
            var handler = PropertyChanged;
            if (handler != null)
            {
                handler(this, new PropertyChangedEventArgs("CycleTime"));
            }
        }
    }
    private int _CycleTime;

    #endregion

    private IOManager _receiver;

    public PreferencesDialog(IOManager receiver)
    {
        this._receiver = receiver;
        InitializeComponent();

        //this.TbMainCycleTime.Text = _receiver.globalBindingProperties.MainCycleTime.ToString();
        this.CycleTime = _receiver.globalBindingProperties.MainCycleTime;
    }

    private void btUpdate_Click(object sender, RoutedEventArgs e)
    {
        _receiver.globalBindingProperties.MainCycleTime = Convert.ToInt32(this.TbMainCycleTime.Text);
        this.Close();
    }

    private void btCancel_Click(object sender, RoutedEventArgs e)
    {
        this.Close();
    }
}

Can someone help me to find what i did wrong? Thanks in advance

A:

your approach is wrong. however if you change these two thing your problem will be solved:
first set DataContext of the Window:
    public PreferencesDialog(IOManager receiver)
{
    this.DataContext = this;

    this._receiver = receiver;
    InitializeComponent();

    //this.TbMainCycleTime.Text = _receiver.globalBindingProperties.MainCycleTime.ToString();
    this.CycleTime = _receiver.globalBindingProperties.MainCycleTime;
}

second remove 'Source' from TextBox.Text.Binding since the source is the dataContext.
    <TextBox Name="TbMainCycleTime" Margin="10,10,0,20" Width="50" Height="25" HorizontalContentAlignment="Right" Validation.ErrorTemplate="{StaticResource ErrorTemplate}" Style="{StaticResource textBoxErrorTooltip}" >
        <TextBox.Text>
            <Binding Path="CycleTime" Mode="TwoWay" UpdateSourceTrigger="PropertyChanged" >
                <Binding.ValidationRules>
                    <genericClasses:IntegersValidation Min="0" Max="1000" />
                </Binding.ValidationRules>
            </Binding>
        </TextBox.Text>
    </TextBox>

