Hi Pavani,
Thank you for your interest in Essential Tools.
You can use ComboDropDown control to hold list of checkboxes and list of radio buttons. You can achieve this by using the PopupControl property of ComboDropDown control.
Please refer the sample in the below link which illustrates the above.
http://websamples.syncfusion.com/samples/Tools.Windows/64295/main.htmPlease try running the above sample and let me know if this helps.
Thanks,
Melba