Can anybody give me an example for modalCtrl.create(ModalClass) with common Component, rather than @IonicPage?

yes, I mean using modal controller without lazy loading.

I tried your suggestion.

import { ModalTrade } from '../../components';

        let ruleModal = this.modalCtrl.create(ModalTrade, { rule: rule });

but errors shows up.

ion-dev.js?v=3.1.8:156 ERROR Error: Uncaught (in promise): Error: No component factory found for ModalTrade. Did you add it to @NgModule.entryComponents?
Error: No component factory found for ModalTrade. Did you add it to @NgModule.entryComponents?
    at noComponentFactoryError (core.js:3789)
    at CodegenComponentFactoryResolver.resolveComponentFactory (core.js:3853)
    at ModalCmp.ionViewPreLoad (modal-component.js:42)
    at ModalImpl.ViewController._lifecycle (view-controller.js:486)
    at ModalImpl.ViewController._preLoad (view-controller.js:348)
    at OverlayPortal.NavControllerBase._preLoad (nav-controller-base.js:753)
    at OverlayPortal.NavControllerBase._viewInit (nav-controller-base.js:443)
    at nav-controller-base.js:254
    at t.invoke (polyfills.js:3)
    at Object.onInvoke (core.js:4629)
    at noComponentFactoryError (core.js:3789)
    at CodegenComponentFactoryResolver.resolveComponentFactory (core.js:3853)
    at ModalCmp.ionViewPreLoad (modal-component.js:42)
    at ModalImpl.ViewController._lifecycle (view-controller.js:486)
    at ModalImpl.ViewController._preLoad (view-controller.js:348)
    at OverlayPortal.NavControllerBase._preLoad (nav-controller-base.js:753)
    at OverlayPortal.NavControllerBase._viewInit (nav-controller-base.js:443)
    at nav-controller-base.js:254
    at t.invoke (polyfills.js:3)
    at Object.onInvoke (core.js:4629)
    at c (polyfills.js:3)
    at Object.reject (polyfills.js:3)
    at OverlayPortal.NavControllerBase._fireError (nav-controller-base.js:223)
    at OverlayPortal.NavControllerBase._failed (nav-controller-base.js:216)
    at nav-controller-base.js:263
    at t.invoke (polyfills.js:3)
    at Object.onInvoke (core.js:4629)
    at t.invoke (polyfills.js:3)
    at r.run (polyfills.js:3)
    at polyfills.js:3rd_place_medal: