How do you have multi flags?

Code:
CommonDialog1.Filter = "Text Files (*.txt)|*.txt|All Files (*.*)|*.*"
CommonDialog1.Flags = cdlOFNHideReadOnly
CommonDialog1.Flags = cdlOFNOverwritePrompt
CommonDialog1.ShowSave
This code only takes the last flag so the Over Write Prompt works, but the Read Only part is still there.