WPF Property Data binding to negate the property - initial value

Question

I want to create just two buttons: [Login] and [Logout] of which only one will be enabled in the same time.

I need to use binding - IsEnabled property of each of the buttons will be bound to another button's property with negation using converter.

I approached interesting problem: how to set the initial values of IsEnabled?

Answer 1

I would bind both buttons to a code-behind property LoggedIn . If LoggedIn is false , the login button is enabled and the logout button is disabled (using the negating converter). Each button would set the LoggedIn property to the respective value.