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**CLASS**
# `GTUIApp`
The GTUI application.
## Properties
### `updateHandlers`
The handlers which are called when a state changes.
### `appID`
The app's id for the file name for storing the data.
### `body`
The app's content.
### `sceneStorage`
The scenes that are displayed.
### `overwriteParentID`
A string signaling that the parent should not be overwritten.
## Methods
### `init(_:body:)`
Initialize the GTUI application.
- Parameters:
- id: The application id.
- body: The application's content.
### `onActivate()`
The entry point of the application.
### `showWindow(_:)`
Focus the window with a certain id. Create the window if it doesn't already exist.
- Parameters:
- id: The window's id.
### `addWindow(_:parent:)`
Add a new window with the content of the window with a certain id.
- Parameters:
- id: The window's id.
- parent: The parent window.
### `setParentWindows()`
Set the parents of every window having a parent window.