1. I have created a full width page called Homepage and added bellow shortcodes.

[teaserbox column="one_third" icon=" http://templatesden.com/TF/WPCMS/apogee/files/2012/02/bulb-yellow.png " title= " New Design Ideas " link="#" ]
Etiam lacinia libero a justo volutpat in rutrum dolor bibendum. Cum sociis natoque penatibus et magnis dis parturient montes.
[/teaserbox]

[teaserbox column="one_third" icon=" http://templatesden.com/TF/WPCMS/apogee/files/2012/02/1328415686_globe-green.png " title= " Global Clients " link="#" ]
Etiam lacinia libero a justo volutpat in rutrum dolor bibendum. Cum sociis natoque penatibus et magnis dis parturient montes.
[/teaserbox]

[teaserbox column="one_third_last" icon="http://templatesden.com/TF/WPCMS/apogee/files/2012/02/arrow_down.png" title= " Fast page loading " link="#" ]
Etiam lacinia libero a justo volutpat in rutrum dolor bibendum. Cum sociis natoque penatibus et magnis dis parturient montes.
[/teaserbox]

[teaserbox column="one_third" icon=" http://templatesden.com/TF/WPCMS/apogee/files/2012/02/clock.png " title= " 24/7 Live Support " link="#" ]
Etiam lacinia libero a justo volutpat in rutrum dolor bibendum. Cum sociis natoque penatibus et magnis dis parturient montes.
[/teaserbox]

[teaserbox column="one_third" icon=" http://templatesden.com/TF/WPCMS/apogee/files/2012/02/1328415699_pie_chart-blue.png " title= " Grow your Business " link="#" ]
Etiam lacinia libero a justo volutpat in rutrum dolor bibendum. Cum sociis natoque penatibus et magnis dis parturient montes.
[/teaserbox]

[teaserbox column="one_third_last" icon="http://templatesden.com/TF/WPCMS/apogee/files/2012/02/hyperlink-blue.png" title= "Google Page Links" link="#" ]
Etiam lacinia libero a justo volutpat in rutrum dolor bibendum. Cum sociis natoque penatibus et magnis dis parturient montes.
[/teaserbox]

2. I have created one more full width page called Hometeaser and added short code like bellow.

[Teaser] The bellow 3 boxes are widgets which are stretchable based on the active widgets, you want to know how I created Homepage? <a href="http://templatesden.com/TF/WPCMS/apogee/how-i-create-homepage/"> click here </a> [/Teaser]

3. Setting in theme options page.

I have selected the Homepage and Hometeaser pages from Theme Options > Frontpage Settings

4. Widget Columns.

There are 4 widget Homepage widget columns called
Home Column1
Home Column2
Home Column3
Home Column4

I used 3 columns and added widgets.

if 2 columns are activated the widget area is stretched to fit 2 columns.