https://jkp-ads.com/articles/keepuserformontop.aspx
Excel 2013 and up; Keeping Userforms on top of SDI windows
Learn how to keep userforms on top of SDI windows in Excel 2013 and later, resolving issues caused by the new Single Document Interface.
on top ofexcelkeeping
https://www.teachexcel.com/excel-tutorial/2043/disable-enable-buttons-in-userforms
Disable/Enable Buttons in UserForms - TeachExcel.com
How to have a button in a UserForm disabled until the desired event occurs For instance you could prevent a submit button from being clicked until the user...
disableenablebuttonsuserforms
https://www.snb-vba.eu/VBA_Excel_customlist.html
VBA voor smarties: VBA customlist in cellen, comboboxen, listboxen en userforms
vbavoorsmartiescellenuserforms
https://www.pamguard.org/api/annotation/userforms/datasel/class-use/UserFormDataSelector.html
Uses of Class annotation.userforms.datasel.UserFormDataSelector
use: package: annotation.userforms.datasel, class: UserFormDataSelector
usesclassannotationuserforms