Need help with gui.pageWidgetByObjectName()

[vyau]

I am using QtInstallerFramework and saw a lot of examples that looks like:

   var widget = gui.pageWidgetByObjectName("DynamicLicenseWidget");

However, I do not see any UI file that has this name (DynamicLicenseWidget in this example) defined. How does this function works to look up that name?

thanks for any tip