InfoPath Dev

  Hi All,     I have a multiple selection list box, I want to detect the de-select action and run an action based on the item user de-selected.     How can I do it?   Thanks

 Hi All,      I have a need to detect and get the get the last checked item and unchecked items in the Multiple Selection List Box .      How can I do it?       Thanks in advance.

 I am new to Infopath and sharepoint.  currently I was tasked to design one registration form, I need do the following:  I have one drop list  which contain 10 topics, each topics can contain many keywords.   for example topic1 has  keyword11 keyword12, keyword13 ... etc.  ...