Crystal Report Control not enabled in tool box

Hi all,

I created a dataset. Using that I created a crystal report. To view that report in webform I should include a crystal report viewer control in form. But in my tool box am having a control called reporting.Under that only Pointer & ReportViewer are enabled.Remaining like CrystalReportViewer...and many are disabled. Can any one help me to enable crystal controls in tool bars. Is there any separate procedure to enable it else whether I need to download any thing?

This might be a simple question. Am a beginner pls help me to get it.

Thanks in advance.