Getting the names of all ajax calendar controls on page

I'm currently trying to get all the names of the ajax calendar controls on a page. But because a lot of the them is wrapped inside the DIVs I can't simply use a foreach loop on the this.controls collection. I did think of maybe I can check if a control is a htmlGenericControl type then check all controls within it but how do I make sure I only go into the DIV controls? I don't do it on the htmlGenericControl controls. Can someone please suggest a good way to do this? Thanks
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