Microsoft has not facilitate option to capture screenshots of apps on Windows Phone. People were expecting to get screenshot feature when Mango OS released

2.  Unlike iPhone, Microsoft has not facilitate an in-built
substitute for capture the screenshots of apps and
games on Windows Phone. People (mostly power
users and tech bloggers like us) were hoping to receive
a really good screenshot feature when Microsoft
launched Mango OS to public, earlier last month.

3.  However, it never happened. Although, as a normal
user you wouldn't bother much about such feature ,
but it is a big help when you need to showcase most of
the apps and games for your friends.

5.  Apple did assimilate this feature long back and now
even Google released an in-built screenshot capture
facility with Ice Cream Sandwich OS. Windows Phone
power users do not need to feel shy about their OS as
Microsoft has integrated 500 new feature in the new
OS.

6.  Talking about the screenshot capture facility, then we
have XDA forum member who has just released an app
that permit you to have a great screenshots on
Windows Phone Mango.

7.  The applying is called as ‘Screen Capturer’, making it
possible to take screenshots employing your camera
button. Users can manage many of the screenshots
within the application itself. This application does
have few limitations as if it saves files to temporary file
as opposed to picture hub, game and films are not
supported yet.

8.  Follow the mentioned steps to get the things done
from Screen Capturer Windows Phone app.
 In the application click ‘Start Capture Task’ to get
started on capturing
 During this time an application will take note of
Camera button event

9.  Navigate to any other Windows Phone application
and then click Camera button to start capturing the
screenshots.
 Once done a notification will ask you to save the
image, tap toast revisit the application.

10.  As you tap the thumbnails, it would delete the files
trapped in temporary image file. Images will probably
be then saved in Picture Hub.
 Read more about this application and updated from
here.