function fireChange(mChanges) {
		if (mChanges) {
			oEventing.fireEvent("change", mChanges);
		}
	}
Register a ThemeManager instance
@param {sap.ui.core.theming.ThemeManager} oManager The ThemeManager to register.
@private
@ui5-restricted sap.ui.core.theming.ThemeManager
@since 1.118.0