# Enable globe issue

**URL:** <https://community.cesium.com/t/enable-globe-issue/36175>\
**Category:** CesiumJS\
**Created:** [October 29, 2024, 11:00am UTC](https://community.cesium.com/t/enable-globe-issue/36175 "2024-10-29T11:00:42Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**Author:** ![Luke\_McKinstry](https://sea2.discourse-cdn.com/cesium/user_avatar/community.cesium.com/luke_mckinstry/32/25557_2.png) [@Luke\_McKinstry](https://community.cesium.com/u/Luke_McKinstry)\
**Post date:** [October 30, 2024, 6:05pm UTC](https://community.cesium.com/t/enable-globe-issue/36175/5 "2024-10-30T18:05:46Z")

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Hi @PaoloPetra,

One additional item to share. The CesiumJS API also supports subscribing to the knockout observable with `Cesium.subscribeAndEvaluate()` (note: this function is marked private so it is not in the documentation, but you can still use it)

> [@Watching for imagery changes](https://community.cesium.com/t/watching-for-imagery-changes/3476/4):
>
> If the imagery layer is being changed from the BaseLayerPicker widget, you can subscribe to [BaseLayerPickerViewModel.selectedImagery](http://cesiumjs.org/Cesium/Build/Documentation/BaseLayerPickerViewModel.html#selectedImagery) to receive notifications when it is changed. Here is a code example: Cesium.subscribeAndEvaluate(viewer.baseLayerPicker.viewModel, ‘selectedImagery’, function(newValue) { console.log(newValue.name); }); Here, newValue is a [ProviderViewModel](http://cesiumjs.org/Cesium/Build/Documentation/ProviderViewModel.html). Is that what you are looking for? -Hannah

More on knockout subscriptions is available here in the docs [cesium/Documentation/Contributors/CodingGuide at main · CesiumGS/cesium · GitHub](https://github.com/CesiumGS/cesium/tree/main/Documentation/Contributors/CodingGuide#knockout-subscriptions)

An alternative to using the baseLayerPicker is the create a separate HTML UI dropdown field to toggle the Google Photorealistic 3D Tiles as described here [Adding and removing Tile provider to the menu? - #4 by omar](https://community.cesium.com/t/adding-and-removing-tile-provider-to-the-menu/10803/4)

Thanks again for coming to the forums with your questions.  
Best,  
Luke

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