Change Installer UI Example

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 function Component()
 {
     gui.pageWidgetByObjectName("LicenseAgreementPage").entered.connect(changeLicenseLabels);
 }

 changeLicenseLabels = function()
 {
     page = gui.pageWidgetByObjectName("LicenseAgreementPage");
     page.AcceptLicenseLabel.setText("Yes I do!");
     page.RejectLicenseLabel.setText("No I don't!");
 }