Thank you for contacting us.
I am not sure if I understand you correctly. What exactly do you want to click?
Do you want to click an HtmlButton which opens a drop down and then select an item?
Please send us a screen shot of the drop down and its DOM tree so I can write you the code.
Another thing is that we don't recommend using XPath. Even a small change in your application will change the XPath and the test will fail.
Here is an example code:
HtmlSelect mySelect = ActiveBrowser.Find.ByName<HtmlSelect>(
Hope to hear from you soon.