textField doesn't update bound property

I have a form in my plugin with some text fields:

class MyPluginConfigurationForm {
  data class Values(
    var url: String,
    // other vars
  )
  lateinit var vals: Values
  private lateinit var settings: Settings.Data
  fun getPanel(): DialogPanel { // is called after createUI()
    return panel {
      row("Settings") {}
      row("Url:") {
        textField(prop = vals::url)
      }
      // other rows with text fields bind to properties
   }
  }
  fun createUI(project: Project) {
    settings = Settings.getInstance(project)
    vals = Values(
      url = settings.url,
      // other args
    )
  }
  fun isModified(): Boolean {
    return vals.url != settings.url // and comparing other properties
  }
  fun apply() {
    settings.url = vals.url
    // other settings update
  }
}

So when I update value in the text field (when running IDE with the plugin and opened that form), the property value is not updated - therefore nothing has changed in Settings.Data object.
Is there any obstacles of binging property to text field with textField() DSL function ? Maybe i missed something when created the form and panel?