https://learn.microsoft.com/en-us/dotnet/api/system.windows.automation.peers.ribbongroupdataautomationpeer.system-windows-automation-provider-iexpandcollapseprovider-expand?view=netframework-4.8.1&viewFallbackFrom=windowsdesktop-10.0
RibbonGroupDataAutomationPeer.IExpandCollapseProvider.Expand Method...
Shows the controls that are in the RibbonGroup.
expandmethod