public void MaterialsCommand_Executed(object sender)
{
if (!AppProperties.FormHaveModifications || DiscardFormModifications())
{
AppProperties.FormHaveModifications = false;
SelfInvoiceButtonStyle = Application.Current.Resources["MainMenuButtonStyle"] as Style;
InvoiceButtonStyle = Application.Current.Resources["InvoiceMenuButtonStyle"] as Style;
CashButtonStyle = Application.Current.Resources["CashMenuButtonStyle"] as Style;
MaterialsButtonStyle = Application.Current.Resources["SelectedMenuButtonStyle"] as Style;
ClientsButtonStyle = Application.Current.Resources["ClientsMenuButtonStyle"] as Style;
FirstInfo = "Materiali inseriti nel sistema:";
SecondInfo = _contoData.MaterialsCountGet().ToString(CultureInfo.InvariantCulture);
SelectedControl = new MaterialsUserControl();
}
}