DataGrid基本的な設定からメモしておく。 <Window x:Class="TawamureDays.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity" xmlns:local="clr-namespace:TawamureDays" Title="MainWindow" Height="213" Width="385" local:WindowBehavior.UseMessageCommand="True" local:Framewo