I'm starting to look at extending LeftAndMain and found the documentation here: http://doc.silverstripe.org/sapphire/en/reference/leftandmain

I thought that adding this http://pastie.org/1925934 would at least give me the menu item My Admin in the CMS, but it doesn't even seem to do that. Can soemeone point me in the right direction?

I start with the following and build it up step by step...

<?php
class CustomAdmin extends LeftAndMain {
	static $url_segment = 'custadmin';
	static $menu_title = 'Custom';
	static $menu_priority = -2;
}

then also create two templates...
CustomAdmin_left.ss
CustomAdmin_right.ss

I Feel really stupid now :O

I forgot to add a _config.php to my folder. Thanks for the help.

Alright, made something really simple (attached), before diving further into the ins and outs of LeftAndMain. There are probably a lot of things I can do easier with LeftAndMain functionality.

If you have further tips, or see things that are a really bad idea, please let me know.

That's a very good start for SS2.4

What's the simliar for SS3.0? Looks like i am forced to use some kind of form and overwrite the getEditForm function

for SS3.0, i can follow the Dashboard module https://github.com/unclecheese/silverstripe-dashboard to extend LeftANDMain

you have to make a new template

ClassName_Content.ss