How do I expand the "component" field to show all?

[Wobstix]

When trying to create a composite item, when selecting a component, not all the components are listed. In fact the available list is very small. I don't seem able to expand it.

[Alex]

I think it is more like a search field. So basically you need to enter item name or SKU and it will show about ~20 items in a search results.