Note in XAML

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If you don’t want to create a new class that derives from Canvas, you could register a customer attach property like the following.

public class AquariumService : DependencyObject  
    {  
        public static readonly DependencyProperty InfoProperty = DependencyProperty.RegisterAttached(  
           "Info",  
           typeof(string),  
           typeof(AquariumService),  
           new PropertyMetadata(string.Empty)  
           );  
        public static void SetInfo(UIElement element, string value)  
        {  
            element.SetValue(InfoProperty, value);  
        }  
        public static string GetInfo(UIElement element)  
        {  
            return (string)element.GetValue(InfoProperty);  
        }  
  
}  

Setting property from XAML markup:

<Canvas x:Name="myCanvas" local:AquariumService.Info="hello,hello" />  

Setting property from code behind:

AquariumService.SetInfo(myCanvas,"hello");  

More info could be found here.

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