You can do this progammatically by using the IsSelected = true of the given MenuItem in the code behid too if I well understand the question, I mean you can test the value AAA using the selected value property of the combo box and then set the IsSelected property of the corresponding item to true

try to do add Updatesourcetrigger = Propertychanged to the xaml in addition to the two way, make sure that the object source bound property implement the INotifyPopertyChanged or is a dependency property

You suggested that this must be done through xaml then try this [code] [/code]

Did you mean something like this? [code]

[/code] Try to copy and paste this in a blanc scene, it that what you want then you can also do this in code behind [code]Rectangle rect = new Rectangle { Width = 50, Height = 50, Fill = new SolidColorBrush(Colors.Blue) }; Canvas.SetLeft(rect, 50); Canvas.SetTop(rect,50); [/code]

Check the code behind at the two levels at the app.cs and at the Mainwindow.cs then tell me whether is there a code there

Witch application did you stoped and started did you mean the Silverlight UI one

Is that you require something like this [Code] [/Code] This code will show One item as selected by default at the compile time and not after firing the application

you have to implement the singleton pattern in this case move the startupuri attribute form the app.xaml and make the constructor of the statup window as private then define a static method within the form and instanciate that form within that static method private LunchWindow() { InitializeComponent(); } static public LunchWindow Singleton() { return new LunchWindow(); } override the OnStartup method of the app.cs and call that static method within the scope of the on startup method public partial class App : Application { protected override void OnStartup(StartupEventArgs e) { LunchWindow singleInstance = LunchWindow.Singleton(); singleInstance.Show(); } }

You can bind the list box to the collection and set the display member path property to the property name wich is name in this case and you will have all names displayed in the list

Make sure to do not add more than one item with the same identifier or key

OK You have two ways to do that, you either implement the INotifyPropertyChanged interface or simply change this CLR property to dependency property to let wpf handle notification

You can use a button that you apply a tool tip control on it as a control template

The string.format(IFormatprovider, string, object) overload method could help you format you date as you wish take a look on that link http://msdn.microsoft.com/en-us/library/1ksz8yb7.aspx[^]