コピー&ペーストなどの特別なコマンドを実行
"Copy", "Cut", "Paste", "Delete", "FrameSelected", "Duplicate", "SelectAll" and so on. Sent only in the editor. Example. Checking that that a frame has the focus:
    //implement frame selection
    if (eventType == EventType.ExecuteCommand || eventType == EventType.ValidateCommand)
    {
        if (Event.current.commandName == "FrameSelected")
            Debug.Log("frame selected" );
    }