public LoginWindowViewModel()
{
Login = "";
Password = "";
LoginCommand = new RelayCommand(LoginFunc, CanLogin);
CreateAccountCommand = new RelayCommand(RegisterFunc, (obj) => true);
}
MainWindowViewModel()
{
SaveXLS = new RelayCommand(SaveToXML,CanSave);
LoadDB = new RelayCommand(Load, (obj) => true);
Logout = new RelayCommand(LogoutFunc,(obj) => true);
}