In the Viewer, we define a variable which can be undefined inside the ViewerControls children. When the ViewerControls matches its children to find out which display it checks for the type that crashed the application because it doesn't exist on undefined.
In the Viewer, we define a variable which can be undefined inside the ViewerControls children. When the ViewerControls matches its children to find out which display it checks for the type that crashed the application because it doesn't exist on undefined.