ZF disable optgroup lable in select

To show a list of categories, I use the 'select' 开发者_运维百科in a form. I insert the categories from the database.

When I look through the select list I get something like this:

0 
art

The optgroup has a label with a number value. I want to remove the label from it so I have just in the list:

art

Without the 0 from the optgroup label.

Thanks in advice.

Nicky

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1. This is a parent element - you can't have that not to be visible and all children visible - doesn't work
2. You would compromise the use of the optgroup

Conclusion: Just don't use optgroups if you don't want them...