wpf selectall

メニューのSelectAll

<ContextMenu>
     <MenuItem Command="ApplicationCommands.Cut" />
     <MenuItem Command="ApplicationCommands.Copy" />
     <MenuItem Command="ApplicationCommands.Paste" />
     <MenuItem Command="ApplicationCommands.SelectAll" />
</ContextMenu>

参考

http://stackoverflow.com/questions/29694307/add-select-all-context-menu-item-to-default-textbox-menu-items