private void DrawArticles()
        {
            pnlButtons.Controls.Clear();
            foreach (Article art in (cmbProfile.SelectedItem as Profile).Articles)
            {
                art.Button = new ArticleButton(art);
                pnlButtons.Controls.Add(art.Button);
                art.Button.Click += (btn, args) =>
                {
                    EditArticleButtonDesignWindow dlg = new EditArticleButtonDesignWindow((Profile)cmbProfile.SelectedItem, art);
                    dlg.ShowDialog();
                    if (dlg.DialogResult == true)
                    {
                        btnReset.IsEnabled = true;
                        btnSave.IsEnabled = true;
                        cmbProfile.IsEnabled = false;
                    }
                    this.Focus();
                };
            }

            DrawNumbers();
        }
        private void DrawArticles(List<int> positions)
        {
            // determine changed articles
            List<Article> articles = new List<Article>();
            foreach (int pos in positions)
            {
                Article art = (from a in (cmbProfile.SelectedItem as Profile).Articles where a.Position == pos select a as Article).FirstOrDefault();

                // clear area
                if (art == null)
                {
                    // get location
                    Point location = new Point(ArticleButton.CalculateArticleLocation(pos).X, ArticleButton.CalculateArticleLocation(pos).Y);
                    foreach (Control c in pnlButtons.Controls)
                    {
                        // location and button match
                        if (c.Location.X == location.X && c.Location.Y == location.Y && c is Button)
                        {
                            pnlButtons.Controls.Remove(c);
                        }
                    }
                }
                // draw article (got this position)
                else
                {
                    art.Button = new ArticleButton(art);
                    pnlButtons.Controls.Add(art.Button);
                    art.Button.Click += (btn, args) =>
                    {
                        EditArticleButtonDesignWindow dlg = new EditArticleButtonDesignWindow((Profile)cmbProfile.SelectedItem, art);
                        dlg.ShowDialog();
                        if (dlg.DialogResult == true)
                        {
                            btnReset.IsEnabled = true;
                            btnSave.IsEnabled = true;
                            cmbProfile.IsEnabled = false;
                        }
                        this.Focus();
                    };
                    art.Button.BringToFront();
                }
            }
        }