void cbm_ClipboardChanged(object sender, Tuple<WIN.Forms.IDataObject> e) {
btnPaste.IsEnabled = e.Item1.GetDataPresent(DataFormats.FileDrop) || e.Item1.GetDataPresent("Shell IDList Array");
btnPasetShC.IsEnabled = e.Item1.GetDataPresent(DataFormats.FileDrop) || e.Item1.GetDataPresent("Shell IDList Array");
}