Looking for documentation or code samples to build an APEX adhoc charting application

 We are developing an application to monitor server statistics and chart them into graphs over a period of time. We have a lot of applications and each application has several servers. We are looking for some documentation or examples where we could use option buttons or some other methods to select multiple items from an option list or drop down box, use them to create dynamic charts. 
For example, we should be able to choose a few applications from a list or query, choose some servers for those selected applications, and create the server statistics charts. The code samples given in APEX 4.0 documentation do not show how to use option buttons to choose multiple items in a list or how to dynamically create graphs with out hard coding the parameters.