Hello everyone.

I have made a program that interacts with a page. I have no problem with dealing with check boxes and hyperlinks but I can't deal with a combo box. The elements on the page are

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It is a combo box to change the number of the rows of a table to be displayed. Any ideas about how this can be handled?

I have tried 
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as well as 
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The first is just just ignored and the second gives me an error of invalid property-method.

Thank you in advance.