Basically, in Yii there is main.php that will render the main layout structure including header, sidebar, mainmenu, content section and footer. Other layouts called column1 or 2 just contain the view of content section in the main layout. But now Im bored with this main.php and would like to use another one. I create main1.php that put it in the layouts folder, so how can I set it as default layout or how can I use it as main layout? Can I use both main.php and main1.php?