[flexcoders] combo box width

[nihilism machine]

i have the following code in a series of form items. im trying to set the
width of the comboboxes so that they match the input boxes. width="100" etc
does not work, any ideas?

<mx:FormItem id="sProjectTypeItem" label="Project Type:">
                   <mx:ComboBox>
                      <mx:ArrayCollection>
                         <mx:String>FLEX Application</mx:String>
                         <mx:String>FLEX Coder</mx:String>
                         <mx:String>Website</mx:String>
                         <mx:String>CMS</mx:String>
                      </mx:ArrayCollection>
                   </mx:ComboBox>
               </mx:FormItem>