pop up on clicking a button

Hi All,

Problem : There is a custom screen in a CRM Transaction. In the screen there is a table which displays data.and there are a few buttons which provides a few functionalities like delete records, display attachments etc. The functionality is provided in a CASE statement. The problem now is I need to provide a popup as soon as the user clicks on a button. this popup will display a list from a table.

I am not able give a popup when i click the button. this will be something like when i click a variant button on a report screen it displaying the list of variants and one of the variants being selected. How do i provide this funtionality it ?

Thanks,

Amit