FOREIGN keys and scaffolding

[eluser]Unknown[/eluser]
hi ,
am very new to codeigniter , and the first thing i tried to do is to create the blog example , i tried to continue on that example , so that i want to create comments from the admin side for example using the scaffold .... the form generated display the FOREIGN KEY : blog_id as a text input , but i need it to be a drop down list with data like ( " blog_title , or blog_id ) .
auto generated drop down list for the FOREIGN key .

any body can help , or provide a link to article or tutorial on this issue .

thanks in advance