I want to add a button below each KPI to view the data summarizing the KPI's

[Qlikuser09]

wanted to add a  button like this to show the additional data referring to the particular KPI , when clicking the button would enable the user to have a detailed data, of the particular selection

[KGalloway]

What exactly do you want the button to do? What do you mean by "enable the user to have a detailed data"?

Produce a chart with data? Start a download of data? Navigate to another sheet that displays the data?

[Qlikuser09]

add a button , when a user clicks the button , i want to show a table chart with the summary of the selected data ( in the table format ) not to navigate to another sheet 

[KGalloway]

Native Qlik buttons cannot produce a chart. You could create the chart and have it on the page with a calculation condition that depend son the button. That way when the button is clicked, the chart will "appear". That is, it will show its data.

Could you provide a small example of what the data would look like? Both the data before clicking the button and the data you want to see after clicking.