RejectButtonOnClick.js

//On Click of Reject button
	onClickOfRejectRibbonButton: function (executionContext) {
		"use strict";		
		var formContext = executionContext;
		var recordId = formContext.data.entity.getId();
		recordId = recordId.replace("{", "");
		recordId = recordId.replace("}", "");
		var contactId = formContext.getAttribute("customerid").getValue()[0].id;
		contactId = contactId.replace("{", "");
		contactId = contactId.replace("}", "");

		var pageInput = {
			pageType: "custom",			
			name: "new_custompage_7e429",
			entityName: "incident",
			recordId: recordId			
		};

		var navigationOptions = {
			target: 2,
			position: 1,
			height: 400,
			width: 700,
			title: "Case Resolution Confirmation" // Enter Title Of Your Choice
		};

		//Using navigateTo Client API.
		Xrm.Navigation.navigateTo(pageInput, navigationOptions).then(
			function success() {
				// Run code on success
				//formContext.data.refresh();
			},
			function error() {
				// Handle errors
				formContext.data.refresh();
			}
		);
	}