C# Definition:

    [StructLayout(LayoutKind.Sequential)]
    public struct TBBUTTON {
    public int iBitmap;
    public int idCommand;
    [StructLayout(LayoutKind.Explicit)]
    private struct TBBUTTON_U {
        [FieldOffset(0)] public byte fsState;
        [FieldOffset(1)] public byte fsStyle;
        [FieldOffset(0)] private IntPtr bReserved;
    }
    private TBBUTTON_U union;
    public byte fsState { get { return union.fsState; } set { union.fsState = value; } }
    public byte fsStyle { get { return union.fsStyle; } set { union.fsStyle = value; } }
    public UIntPtr dwData;
    public IntPtr iString;
    }

VB Definition:

    Public Structure TBBUTTON
        Public iBitmap As Integer
        Public idCommand As Integer
        Public fsState As Byte
        Public fsStyle As Byte
        Public bReserved0 As Byte
        Public bReserved1 As Byte
        Public dwData As Integer
        Public iString As Integer
    End Structure

User-Defined Field Types:

None.

Notes:

None.