private void ValidateForm(TextBox txtPurpose, DatePicker txtDateRequired, ComboBox comboPRType, DataGrid dgItems, out bool Validated)
        {
            Validated = false;

            if (dgItems.Items.Count <= 0) {
                dgItems.FlagAsError();
                return;
            } dgItems.FlagAsNormal();

            if (txtPurpose.Text.IsNullOrEmpty()) {
                txtPurpose.FlagAsError();
                return;
            } txtPurpose.FlagAsNormal();

            if (comboPRType.SelectedIndex == -1) {
                comboPRType.FlagAsError();
                return;
            } comboPRType.FlagAsNormal();

            if (txtDateRequired.Text.IsNullOrEmpty()) {
                txtDateRequired.FlagAsError();
                return;
            } txtDateRequired.FlagAsNormal();

            Validated = true;
        }