Hello Mani,
Unfortunately, this behaviour cannot be accomplished via a configuration setting at the moment. What we can do is add some custom JavaScript that will add a placeholder value upon the successful load of the form. Please see the code sample attached below that will add a placeholder to a TPC Picklist that says: “Please select an option”. You can add this to the page using a TPC JavaScript widget.
/**
* This sample will add default value placeholder text to a TPC Picklist.
*/
$(document).on("tpc:ready", function(){
//Name of Picklist
var picklistName = "accountcategorycode";
//Set Text to Placeholder Value
tpc.forms[0][picklistName].get_kendoInput().text("Please select an option.");
});
Cheers,
Josh