How to modify Connect Login dialog in ProjectWise SDK?

issue:

We are in the process of infrastructure migration to the cloud. Upgrade from PWv8i to CONNECT is part of it.
To interface PW from the GIS desktop application, we use PW SDK.
We found PW Login UI discrepancies between v8i & CONNECT:

- CONNECT version has an Authentication dropdown list

- CONNECT version has a CONNECT button


To establish the connection to PW, we call:
LONG_PTR aaApi_LoginDlgExt(HWND hWndParent, LPCWSTR lpctstrTitle, ULOulFlags,
LPWSTR lptstrDataSource, LONG lDSLength, LPCWSTR lpctstrUsername, LPCWSTR lpctstrPassword, LPCWSTR lpctstrSchema)
In the PWPublicSDK.chm we cannot find details about ulFlags that specify login operation and dialog style mask. It can be 0 or a bit-wise OR a combination of flags listed in Login Dialog Style Flags. Previously, we used ulFlags set to Zero. Login Dialog Style Flags are not available in the documentation.

All users would be using Windows SSO authentication. We are checking PW SDK CONNECT for:• Hiding Authentication Picklist
• Setting default Authentication to “Windows Domain” instead of “ProjectWise”

Please, provide the following details:
1. Is it feasible to hide Authentication Picklist & set the default to “Windows Domain”?
2. If Yes, then what args to pass to aaApi_LoginDlgExt to achieve item#1?