How to hide DXDialogWindow's header buttons

[DevExpress Support Team: CLONED FROM T601990: DxDialogWindow c/w DataLayoutControl]
Hi

I am using a DXDialogWindow to show a Login Dialog at application startup.  Whist there are examples of this in the help files and support tickets I have need allow the login to allow some fixed values when the application is run first time and then later on refer to the application's backend database to verify a user's name and password.  So to that extent the login view needs to have a corresponding viewmodel that can take this scenario into account.  I have therefore opted to use the messenger service to communicate back to the mainViewModel that instantiated the Login Dialog when the login is closed.

The problem I'm currently facing is one of layout.  Firstly I'm using the DataLayout control because I want to make use of its ability to show datavalidation symbols (that works).  I also want to be able to show a simple check or cross image to the side of the User Name and Password Datalayout items that will be shown (with the appropriate image) when the user name and password have been validated.  Only a valid combination will trigger the enablement of the login button.

Before adding the image placeholders into the view the layout (thanks to the datalayout control) worked nicely.  Since adding them it doesn't (see the attached image)

Secondly, given that dialog is there purely to get the end user to enter their name and password it really only needs the login and cancel buttons to handle closure.  Can I remove the standard min, max and close buttons that form part of the dialog window chrome, and if so how.

This is the current xaml I have for the view

XAML
<UserControl xmlns:dxe="http://schemas.devexpress.com/winfx/2008/xaml/editors"  x:Class="ViewToLearn.FishTrackerEnterprises.Modules.Views.LoginView"  
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"  
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"  
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"  
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"  
             xmlns:dxmvvm="http://schemas.devexpress.com/winfx/2008/xaml/mvvm" xmlns:ViewModels="clr-namespace:ViewToLearn.FishTrackerEnterprises.Modules.ViewModels"  
             xmlns:dxlc="http://schemas.devexpress.com/winfx/2008/xaml/layoutcontrol"  
             xmlns:dx="http://schemas.devexpress.com/winfx/2008/xaml/core"  
             mc:Ignorable="d"  
             DataContext="{dxmvvm:ViewModelSource Type=ViewModels:LoginViewModel}"  
             d:DesignHeight="100" d:DesignWidth="300">  
    <Grid>  
        <dxlc:DataLayoutControl Orientation="Vertical" AutoGenerateItems="False" CurrentItem="{Binding}" dxe:ValidationService.IsValidationContainer="True">  
            <dxlc:LayoutGroup Orientation="Vertical">  
                <StackPanel Orientation="Horizontal"  Margin="4">  
                    <dxlc:DataLayoutItem Label="User Name" >  
                        <dxe:TextEdit Text="{Binding UserName, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay, ValidatesOnDataErrors=True, NotifyOnValidationError=True, ValidatesOnExceptions=True, ValidatesOnNotifyDataErrors=True}" />  
                    </dxlc:DataLayoutItem>  
                    <Image x:Name="UserNameImage"  Height="16" Width="16" />  
                </StackPanel>  
                <StackPanel Orientation="Horizontal" Margin="4">  
                    <dxlc:DataLayoutItem Label="Password" >  
                        <dxe:TextEdit Text="{Binding Password, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay, ValidatesOnDataErrors=True, NotifyOnValidationError=True, ValidatesOnNotifyDataErrors=True}" />  
                    </dxlc:DataLayoutItem>  
                    <Image x:Name="PasswordImage"  Height="16" Width="16" />  
                     </StackPanel>  
            </dxlc:LayoutGroup>  

            <dxlc:LayoutGroup Orientation="Horizontal" HorizontalAlignment="Right">  
                <dx:SimpleButton  Height="22" Width="75" Content="Login" Command="{Binding LoginCommand}" />  
                <dx:SimpleButton  Height="22" Width="75" Content="Cancel" Command="{Binding CancelCommand}" />  
            </dxlc:LayoutGroup>  
        </dxlc:DataLayoutControl>  
    </Grid>  
</UserControl>  

and for the sake of completeness this is the viewmodel as it stands

C#
using System;  
using DevExpress.Mvvm.DataAnnotations;  
using DevExpress.Mvvm;  
using DevExpress.Mvvm.POCO;  
using System.ComponentModel.DataAnnotations;  
using ViewToLearn.FishTrackerEnterprise.Common;  


namespace ViewToLearn.FishTrackerEnterprises.Modules.ViewModels  
{  
    [POCOViewModel(ImplementIDataErrorInfo = true)]  
    public class LoginViewModel  
    {  
        [Required(AllowEmptyStrings = false, ErrorMessage ="User Name is required.")]  
        public virtual string UserName { get; set; }  
        [Required(AllowEmptyStrings = false, ErrorMessage = "Password is required.")]  
        public virtual string Password { get; set; }  

        private bool LoginPassed;  

        public LoginViewModel()  
        {  
        }  

        //public static LoginViewModel Create()  
        //{  
        //    return ViewModelSource.Create(() => new LoginViewModel());  
        //}  

        public void Login()  
        {  
            SendMessage(LoginMessageType.Succeeded);  
        }  

        public void Cancel()  
        {  
            SendMessage(LoginMessageType.Canceled);  
        }  

        public bool CanLogin()  
        {  
            return LoginPassed;  
        }  

        protected void OnUserNameChanged()  
        {  

        }  

        protected void OnPasswordChanged()  
        {  

        }  

        void SendMessage(LoginMessageType loginMessage)  
        {  
            Messenger.Default.Send(new LoginMessage(loginMessage));  
        }  
    }  
}  

The Login dialog is called from the main viewmodel like so;

C#
public void Login()  
    {  
        LoginViewModel loginViewModel = ViewModelSource.Create(() => new LoginViewModel());  
        DialogService.ShowDialog(dialogCommands: null, title: "Login", viewModel: loginViewModel);  

    }  

Many thanks

Dom