WPF

public abstract class ViewModelBase : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;
    /// <summary>
    /// Raised because the property has changed.
    /// </summary>
    /// <param name="property">The name of the property that changed.</param>
    protected virtual void OnChanged(string property)
    {
      var handler = PropertyChanged;
      if (handler == null)
      {
        return;
      }

      handler(this, new PropertyChangedEventArgs(property));
    }
}

private string _passCode;
public string PassCode
{
  get { return _passCode; }
  set
  {
    if (_passCode == value) return;
    _passCode = value;
    OnChanged("PassCode");
  }
}

public class MyRadioButton : RadioButton
{
    protected override void OnKeyDown(KeyEventArgs e)
    {
        if (e.Key == Key.A)
            OnClick();
        else
            base.OnKeyDown(e);
    }
}

Mark Salsbery
Microsoft MVP - Visual C++

private void imgCalendar_PreviewMouseUp(object sender, MouseButtonEventArgs e)
{
    //Microsoft.Windows.Controls.DataGridCell cell = sender as Microsoft.Windows.Controls.DataGridCell;
    Microsoft.Windows.Controls.DataGridCell cell = FindVisualParent<Microsoft.Windows.Controls.DataGridCell>(sender as Image);
    Microsoft.Windows.Controls.DataGrid dataGrid = FindVisualParent<Microsoft.Windows.Controls.DataGrid>(cell);
}

Mark Salsbery
Microsoft MVP - Visual C++

modified on Tuesday, May 10, 2011 4:59 PM

System.Windows.Data Error: 40 : BindingExpression path error: 'CellBackground' property not found on 'object' ''Person' (HashCode=51777710)'. BindingExpression:Path=CellBackground; DataItem='Person' (HashCode=51777710); target element is 'DataGridCell' (Name=''); target property is 'Background' (type 'Brush')

<DataGrid.CellStyle>
    <Style TargetType="{x:Type DataGridCell}">
        <Setter Property="Foreground" Value="Black"/>

        <Setter Property="Background"
       Value="{Binding Path=DataContext.CellBackground, RelativeSource={RelativeSource FindAncestor, AncestorType=UserControl, AncestorLevel=1}}"/>
    </Style>
</DataGrid.CellStyle>

namespace MySample.Converters
{
  using System;
  using System.Globalization;
  using System.Windows.Data;
  using System.Windows.Media;

  /// <summary>
  /// Converter to determine whether or not a number is negative, and apply 
  /// conditional formatting if it is.
  /// </summary>
  public class StatusTextColorConverter : IValueConverter
  {
    #region IValueConverter Members
    /// <summary>
    /// Convert from the value to the colour brush.
    /// </summary>
    /// <param name="value">The value to convert.</param>
    /// <param name="targetType">The parameter is not used.</param>
    /// <param name="parameter">The parameter is not used.</param>
    /// <param name="culture">The parameter is not used.</param>
    /// <returns>The populated colour brush.</returns>
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
      var brush = new SolidColorBrush(Colors.White);

      if (value != null && value == "Locked")
      {
        brush = Colors.Yellow;
      }

      return brush;
    }

    /// <summary>
    /// Unused in this implementation.
    /// </summary>
    /// <param name="value">The parameter is not used.</param>
    /// <param name="targetType">The parameter is not used.</param>
    /// <param name="parameter">The parameter is not used.</param>
    /// <param name="culture">The parameter is not used.</param>
    /// <returns>The parameter is not used.</returns>
    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
      throw new NotImplementedException();
    }

    #endregion
  }
}

<conv:StatusTextColorConverter x:Key="statusTextColorConverter"/>

<Setter Property="Background" Value="{Binding Path=PropertyContainingEditableText, Converter={StaticResource statusTextColorConverter}}}"/>

<StatusBar ...>
  <StatusBar.ItemsPanel>
	<ItemsPanelTemplate>
		...
	</ItemsPanelTemplate>
  </StatusBar.ItemsPanel>  

  ...items...

</StatusBar>