private void omzetrapportageToolStripMenuItem_Click(object sender, EventArgs e) { panel1.Controls.Clear(); groupBox1.Text = "The Revenue Report"; panel1.Controls.Add(SomerenUI.showRevenueReport()); //add the interface for the report (calendar and button) panel1.Controls.Add(picker_from_form); panel1.Controls.Add(picker_to_form); panel1.Controls.Add(From_text_button); panel1.Controls.Add(To_text_button); panel1.Controls.Add(limited_report_button); //formating date into dd-mm-yyyy picker_from_form.Format = DateTimePickerFormat.Custom; picker_from_form.CustomFormat = "dd-MM-yyyy"; picker_to_form.Format = DateTimePickerFormat.Custom; picker_to_form.CustomFormat = "dd-MM-yyyy"; }