There are a few ways to do it.
1. Do through coding ( Code Behind ).

this.WindowStyle = WindowStyle.None;

2. Do through XAML. Add in the WindowStyle attribute to the Window Tag
Window WindowStyle="None">

3. Editing through the properties ( Ultimately, this changes the XAML )

Properties

You can check out the sample application here.
http://cid-29f099c37b76ca59.office.live.com/self.aspx/Blog/Code%20Guide/Windows%20Presentation%20Foundation/RemoveTitleBarWPF.zip

If you have any questions, please feel free to contact me at guohong@limguohong.com

Based on Theme Resources for Windows Phone, under Theme Visibility and Opacity.
By checking Resources, I am able to check if its Visible or Collapsed for the dark or White theme by doing this

Visibility isLight = (Visibility)Resources["PhoneLightThemeVisibility"]; // for light theme
Visibility isDark = (Visibility)Resources["PhoneDarkThemeVisibility"]; // for dark theme

Then we use if else to check,

if (isLight == System.Windows.Visibility.Visible)
{
//We are on light theme
}

Light Theme

or

if (isDark == System.Windows.Visibility.Visible)
{
//We are on dark theme
}

Dark Theme

Attached is a sample code to show how do I detect Windows Phone 7 theme, before the Mango buuild ( I am unsure if there is a change after Mango ).
Detect Theme on Windows Phone 7 Sample

Recently, I worked on an app for the Windows Phone 7 platform and submitted it to the marketplace for certification. I’ve learnt many things and gained many insights after going through this process and would like to share one of these with you, developers and potential developers of the Windows Phone 7 platform.

Throughout this post, I will be making references to the official Windows Phone 7 Application Certification Requirements document (WP7ACR) which can be downloaded athttp://go.microsoft.com/?linkid=9730558.

Under Section 5.2.4 of the WP7ACR, clause a, it is stated that:

Pressing the Back button from the first screen of an application must exit the application.

Developers who are creating apps with multiple pages must give special attention to this clause because pressing the back button automatically brings the user to the previous page, regardless of whether the user is at the first screen or not. Consider the following example:

In this app, there are 2 pages. Page1 goes to Page2 via a button with the following logic:

NavigationService.Navigate(new Uri(“/Page2.xaml”, UriKind.Relative));

Page2 goes back to Page1 via a button with the following logic:

NavigationService.Navigate(new Uri(“/Page1.xaml”, UriKind.Relative));

Each time that line of code is executed, it is actually creating a new instance of the page defined under the new Uri. Therefore if the user navigates in this manner:

1. User starts the app.
2. User navigates to Page2 via button.
3. User navigates to Page1 via button.

At this point in time, the user is at the first page of the application. If the user presses the back button, he will be brought back to Page2 instead of exiting the app, which is wrong and will result in a failure of the certification process.

There is no API in the Windows Phone 7 SDK similar to the Application.Exit() function found in the average C#.NET Windows Forms application. For this reason, we must overcome this problem by navigation by page hierarchy. That is to say, when the user navigates from Page2 to Page1 via the button, instead of treating Page1 as a new page, the developer should instead use this line of code for the navigation purpose from Page2 back to Page1:

NavigationService.GoBack();

By doing this, the developer is essentially coding the button to function exactly like what the back button does on the Windows Phone. In this way, the app will always exit when the back button is pressed on the first page because the first page is always the only record under the action history when the user is on the first page. The diagram will then look like this:

Therefore we have successfully adhered to Section 5.2.4 of the WP7ACR, clause a. This is how we can effectively use the Back button and pass certification for functions relating to the back button.

I am gonna rewrite one of her guide for my school’s bootcamp. Hope to get it done when I am free next week ( After Monday ). I never knew that program was so cool.

Going to teach wushu tomorrow morning!

Guo Hong now wants to write some simple application using C# but not sure what he can write.

I am looking to do a full HTML or CSS reference and tutorial website once I am done with my current website and promotion.

I have a few domains to use.

To do list:
-Upgrade my blog’s script
-C# boot camp #2 / #3 ( Its lying in my admin panel for very long already. )
-Disclaimer and About Me page.
-Clear up unused domains in my cPanel
-Clear up unused MySQL in my cPanel

Anyway it was fun. 3 letters to summarise the whole UX ( User Experience ). Haha

This maybe useful for me in the future.
//This is how to comment in C#
//This is how to make a message box come out, Message.Show
//(CONTENT OF MESSAGE BOX, TITLE OF THE MESSAGE BOX)
Message.Show("Guo Hong", "Title")

In php, to add things on to a string variable, we do
$des = "Guo Hong is ";
$des .= "handome.";

but in C#,
string des = "Guo Hong is ";
des += "handome.";

Notice the += and .= ?

Haha, hopefully tomorrow will be more interesting!