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combobox move

On the following method:

dhtmlxEvent(document.body,"scroll",dhtmlXCombo.prototype.closeAll);

what is the meaning of dhtmlXCombo,prototype and closeAll?

Can you give me an example about the application ?

As result of such code - each time when document will be scrolled - closeAll method of combo class will be called, which close any opened combo list. 
Sample attached