Enable button based on TextBox value (WPF)

Question

This is MVVM application. There is a window and related view model class.

There is TextBox, Button and ListBox on form. Button is

Answer 1

Things look much clearer now with the edits, thanks! This might be a stupid question (I'm somewhat tired of a long day's work), but why don't you bind to the command directly, instead of through a static resource?

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