[*resolved]Help me get system scrollbar's width

[MrPolite]

I need to find out the width of a system scroll bar (you know that this changes if you have different themes/styles on your computer).
So for example I need to know how wide is a vertical scroll bar.I have this GetScrollInfo API, dunno if I should use it or not.

<StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Auto)> _
    Private Structure SCROLLINFO
        Public cbSize As Integer
        Public fMask As Integer
        Public nMin As Integer
        Public nMax As Integer
        Public nPage As Integer
        Public nPos As Integer
        Public nTrackPos As Integer
    End Structure
 
    <DllImport("user32.dll", CharSet:=CharSet.Auto)> _
    Private Function GetScrollInfo(ByVal hwnd As IntPtr, ByVal bar As Integer, ByRef si As SCROLLINFO) As Integer
    End Function

any help appriciated!