Add multirows in Attendees selection (#11067)

diff --git a/erpnext/hr/doctype/training_event/training_event.js b/erpnext/hr/doctype/training_event/training_event.js
index 6a6e8fe..12bc920 100644
--- a/erpnext/hr/doctype/training_event/training_event.js
+++ b/erpnext/hr/doctype/training_event/training_event.js
@@ -2,6 +2,9 @@
 // For license information, please see license.txt
 
 frappe.ui.form.on('Training Event', {
+	onload_post_render: function(frm) {
+		frm.get_field("employees").grid.set_multiple_add("employee");
+	},
 	refresh: function(frm) {
 		if(!frm.doc.__islocal) {
 			frm.add_custom_button(__("Training Result"), function() {
@@ -18,4 +21,4 @@
 			});
 		}
 	}
-});
\ No newline at end of file
+});