In order to achieve the desired functionality, you could use the OnClientTransferring
client-side event. In the handler, you could verify the Source ListBox (using get_sourceListBox().get_id()
) and the item, which is currently about to be transfer. If the item's text is Argentina, you could use the args.set_cancel(true)
function to cancel the transfer.
I have prepared as sample example for you, demonstrating the implementation of the above suggestion.
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