private void cboProjects_SelectedIndexChanged(object sender, EventArgs e)
        {
            string projectName = cboProjects.SelectedItem.ToString();

            EditingProject = MainForm.Projects.LoadUnloadProjectHandler(projectName);

            this.txtPref.Text = EditingProject.GetProjectPreference().OuterXml;

            _originalData = this.txtPref.Text;
        }