private void SetupContextCopy()
 {
     TextBoxEthereum.AddContextMenu();
     TextBoxETC.AddContextMenu();
     TextBoxXMR.AddContextMenu();
     TextBoxLTC.AddContextMenu();
     TextBoxBTC.AddContextMenu();
 }
 private void TextBoxLTC_MouseClick(object sender, MouseEventArgs e)
 {
     TextBoxLTC.SelectBeforeContext();
 }