Hello Shahid,
What you are experiencing is the default behavior of the combobox when Load on Demand is used. The
ItemsRequested event occurs when the
EnabledLoadOnDemand property is
True and the user types text into the input field or clicks on the drop-down toggle image when the list is empty.
To fulfil your requirements my suggestion is to subscribe on the
OnClientDropDownOpening event of the combobox, which is fired when it's about to expand. In the event handler for this event you should call the
requestItems
client side method of the combobobox, which will initiate request and the ItemRequested event will be fired. The implementation of the OnClientDropDownOpening event handler should be as following:
Regards,
Dimitar Terziev
the Telerik team
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