private void TxtSearchQuery_LostFocus(object sender, EventArgs e)
 {
     if (string.IsNullOrWhiteSpace(txtSearchQuery.Text))
     {
         txtSearchQuery.Text = SharedConstants.SearchText;
         SearchFocusLost?.Invoke(this, new EventArgs());
         treeBookmarks.Invalidate();
     }
 }
 private void TxtSearchQuery_PreviewKeyDown(object sender, PreviewKeyDownEventArgs e)
 {
     if (e.KeyCode == Keys.Escape)
     {
         txtSearchQuery.Text = SharedConstants.SearchText;
         SearchFocusLost?.Invoke(this, new EventArgs());
         treeBookmarks.Invalidate();
         treeBookmarks.Focus();
     }
 }