Enable asp button on RadCombobox and RadDatePicker

Hi Salman,

You can leverage the following event handlers to achieve this requirement:
http://docs.telerik.com/devtools/aspnet-ajax/controls/combobox/client-side-programming/events/onclientselectedindexchanged
http://docs.telerik.com/devtools/aspnet-ajax/controls/datepicker/client-side-programming/events/ondateselected​

Also, you can try replacing your regular button with RadButton, which provides set_enabled() method:
http://www.telerik.com/forums/set-enabled-disabled-radbutton-from-client-side#lyZcctMUUUmR1h8J2XA8ZA

I hope this will prove helpful.

Regards,
Eyup
Telerik