BorderSetFlags

Success = BorderSetFlags(Border, Flags)

Border
The handle of the generated border object.

Flags
A combination of flags specifying the border style. You can combine general flags (applying to all sides unless overridden) with side-specific flags.

; General Styles (apply to all sides unless overridden)
#PG_Border_Solid ; Default if no style specified
#PG_Border_Double
#PG_Border_Inset
#PG_Border_Outset
#PG_Border_Groove
#PG_Border_Ridge
#PG_Border_Dot
#PG_Border_Dash

; Side-Specific Styles (override general styles for a specific side)
#PG_Border_LeftSolid, #PG_Border_LeftDouble, #PG_Border_LeftInset, #PG_Border_LeftOutset, #PG_Border_LeftGroove, #PG_Border_LeftRidge, #PG_Border_LeftDot, #PG_Border_LeftDash
#PG_Border_TopSolid, #PG_Border_TopDouble, #PG_Border_TopInset, #PG_Border_TopOutset, #PG_Border_TopGroove, #PG_Border_TopRidge, #PG_Border_TopDot, #PG_Border_TopDash
#PG_Border_RightSolid, #PG_Border_RightDouble, #PG_Border_RightInset, #PG_Border_RightOutset, #PG_Border_RightGroove, #PG_Border_RightRidge, #PG_Border_RightDot, #PG_Border_RightDash
#PG_Border_BottomSolid, #PG_Border_BottomDouble, #PG_Border_BottomInset, #PG_Border_BottomOutset, #PG_Border_BottomGroove, #PG_Border_BottomRidge, #PG_Border_BottomDot, #PG_Border_BottomDash

; Masking Control
#PG_Border_NoMask     ; Disables internal mask generation (can optimize simple square borders).
#PG_Border_MaskInside ; Renders the border mask inside the border edge instead of centered on it.

IncludeFile "ProGUI_PB.pbi"

StartProGUI()

MyBorder = CreateBorder(#PG_Border_Solid, 5)

If MyBorder
  ; Change style to have a dashed top and dotted bottom
  NewFlags = #PG_Border_Solid | #PG_Border_TopDash | #PG_Border_BottomDot
  If BorderSetFlags(MyBorder, NewFlags)
    Debug "Border style flags updated."
  EndIf
  FreeBorder(MyBorder)
EndIf

StopProGUI()