private void LoadPreview(string url)
{
//var report = XtraReport.FromFile(url, true);
//if (report is IReport)
// (report as IReport).LoadDataSource();
//report.ShowPreview();
PreviewControl preview = new PreviewControl(url);
preview.Reload();
preview.Dock = DockStyle.Fill;
var tab = tabMain.TabPages.Add();
tab.Text = "Preview";
tab.Controls.Add(preview);
tabMain.SelectedTabPage = tab;
}