void ICommand.Execute(object sender)
 {
     if (ColumnsDialog.ShowDialog((IWin32Window)owner, theme))
     {
         owner.RefreshColumns();
     }
 }
        public static bool ShowDialog(IWin32Window owner, Theme theme)
        {
            ColumnsDialog dialog = new ColumnsDialog();

            return(dialog.ShowDialog(owner, theme.Id));
        }