grammatical number - Is "a row of" plural or singular?


I see an example in Longman dictionary. For the word of "toolbar", it says, "a row of small pictures at the top of a computer screen that allow you to do particular things in a document". I am confused about it. The subject is "a row of small pictures" while its clause goes like "that allow you..." I think it should be like "that allows you..." Being a famous dictionary, it should be grammatical correct, even when offering a phrase instead of a complete sentence. I see in some small dictionary, an example is, "The first row alone consists of five rooms." Why Longman dictionary says that way?




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