Concerning Wizard addons

Hi, i’ll been tryng for sometime to integrate an app made with wizard addon into another different app but this made without the addon, but when i try to “call” the wizard addon app from the normal app, sorry if i not make myself very clear, a mistake pops out:
these are the lines that i write into the normal app
VerticalLayout new1 = new VerticalLayout();
WizardApplication newWizard = new WizardApplication();
and the error that pops out: java.lang.IllegalStateException: com.vaadin.ui.VerticalLayout already has a parent.
I you have any clues that help to finish my work i’ll aprecciate it so much.