WPF ToolTip does not update

Question

Assuming I have a simple class that represents a staff member

class Staff
{
    public string FirstName { get; set; }
    public string FamilyName { get; set         


        

Answer 1

In this particular case there is a cool trick you can use

Seconds Alive Now = Seconds Alive originally + Elapsed Time

You can bind to the Elapsed Time property and specify a converter that adds the initial value to it. That way you only need to raise 1 event and the tooltips would all be updated.

Edit: You can add the ElapsedTime property (with INotifyPropertyChanged) to many places -- one logical place could be to the collection that is storing your Staff objects

Edit: You would also need to bind each tooltip to the shared ElapsedTime property rather than the SecondsAlive property