private void SearchWindow_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.Escape)
            {
                this.Close();
            }
            else if (e.KeyCode == Keys.F3 && e.Shift)
            {
                if (outputRichTextBox.LastWord == "")
                    outputRichTextBox.ShowSearchWindow();
                else
                {
                    var word = outputRichTextBox.LastWord;
                    var mouthIndexPos = outputRichTextBox.SelectionStart;
                    outputRichTextBox.Index  = mouthIndexPos;
                    var index = outputRichTextBox.Index;
                    this.outputRichTextBox.SearchAndSelectWord(word, 0, index, RichTextBoxFinds.Reverse);
                }
            }
            else if (e.KeyCode == Keys.F3)
            {
                if (this.outputRichTextBox.LastWord == "")
                    this.outputRichTextBox.ShowSearchWindow();
                else
                {
                    var mouthIndexPos = outputRichTextBox.SelectionStart;
                    var word = this.outputRichTextBox.LastWord;
                    this.outputRichTextBox.Index = outputRichTextBox.SelectionStart;
                    var endPos = this.outputRichTextBox.TextLength;
                    var startPos = outputRichTextBox.Index + word.Length;

                    if (startPos > endPos)
                        startPos = endPos - 1;

                    this.outputRichTextBox.SearchAndSelectWord(word, startPos, endPos, RichTextBoxFinds.None);
                }
            }
        }