ToggleButtonGroup is marking the asset as dirty as long as you have it selected in main stage.

Steps to reproduce:

1. Create ToggleButtonGroup
2. Exit UI Staging to be at the main stage
3. Select the ToggleButtonGroup
4. Notice the Hierarchy being repainted constantly

Actual results: When ToggleButtonGroup is selected in main stage, the hierarchy repaints constantly marking the asset as dirty.

Expected results: When ToggleButtonGroup is selected in main stage, the hierarchy should not repaint constantly.

Reproducible with versions: 6000.7

Not reproducible with versions: 

Can't test with versions: 

Tested on (OS): Windows, MacOS

Notes:

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