WPF DataGridTextColumn binding doesn't accept decimals

Question

I don\'t understand what the problem could be. The binding is on a Decimal property. Here is the XAML:

Answer 1

UpdateSourceTrigger=PropertyChanged reevalutes the text on every keystroke. A number that ends in a decimal point is invalid. Change the UpdateSourceTrigger to LostFocus (same as removing it) or try to type the '.' while you have other digits after it.