UIAction openDialogAction = OpenDialogAction.build{
  type = "ShowCenter"           //Display mode, currently supports two modes: "ShowCenter (centered dialog)" and "FullScreen (full-screen display)"
  title = "Mandatory Notice"    //Title
  width = 800                   //Width, only effective in ShowCenter mode
  maxHeight = 123               //Maximum height, only effective in ShowCenter mode
  userData = ["key":"value"]    //Returned data, this part is user data with map data structure
  component {                   //Custom component
    apiName = "component_PhjHJ__c"   //API name of custom component
  }
}

return openDialogAction