// https://stackoverflow.com/questions/22790181/wpf-datagrid-row-double-click-event-programmatically
void dgPatterns_RowDoubleClick(object sender, MouseButtonEventArgs e)
{
dgPatterns.CancelEdit();
// https://stackoverflow.com/questions/16236905/access-parent-window-from-user-control
var dlg = new PatternsDetailDlg(Window.GetWindow(this), vm, (MPattern)((DataGridRow)sender).Item);
dlg.ShowDialog();
}
void btnAddPattern_Click(object sender, RoutedEventArgs e)
{
var dlg = new PatternsDetailDlg(Window.GetWindow(this), vm, vm.NewPattern());
dlg.ShowDialog();
}