如何引用某些Windows元素（滚动条，推入选项按钮等）使用的BG颜色？

Question

Does anybody know how can I reference in C# a system background color, used on elements like scrollbar or pushed-in option button or tab (as the background for 'tabPage1' in the image below)?
Or, if no predefined const exists, any algorithm how to create a Brush with this color? Thank you!

My intuitive first choice SystemColors.ScrollBar results in same as .Control or .ButtonFace (BG for 'tabPage2'), which is really a "face" color for the scrollbar, not what I'd call "background".
SystemColors.ControlLight or SystemColors.ControlLightLight do not get any closer..

When zoomed in, that area of the control looks like a checker-board with .Control and .Window pixels, so to me that hints at a possibility of this color being dithered; maybe that indicates the reason why standard SystemColors enum does not define it? How would I apply it to another control?

PS: I'm trying to enhance a custom TabControl (which supports disableable tabs - another good thing missing from std controls, but that's another and already solved story), so that when its .Appearance is set to Buttons or FlatButtons , it looks similar to the original (illustrated above). Selected tab is indicated by a pushed-in button, but its background color is set to Control or ButtonFace :

Answer 1

Ok, this turns out to be a lot simpler than I thought - it's just about the Brush , used to fill the BG-rect:

protected override void OnDrawItem( DrawItemEventArgs e )
{
    base.OnDrawItem( e );

    int         i=  e.Index;
    TabPage     p=  this.TabPages[ i ];
    Rectangle   r=  GetTabRect( i );
    Brush       br= null;

    if(  this.Appearance != TabAppearance.Normal  &&  i == this.SelectedIndex  )
        br= new HatchBrush( HatchStyle.Percent50, SystemColors.Control, SystemColors.Window );
    else
        br= new SolidBrush( p.BackColor );

    try                     // fill the BG-rectangle
    {   e.Graphics.FillRectangle( br, r );      }
    finally
    {   br.Dispose( );  }   // make sure brush is disposed of

    ..  // the rest of the event-handler
}

The only trick is that a using( Brush br= new .. ) {..} block cannot be applied, as initialization differs with resulting object type. Hence, a somewhat ugly try-finally construct. Works as a charm!

Answer 2

I'm sorry I don't know Forms very well, but MFC has a function for providing such dithered bitmaps ( AfxGetDitheredBitmap ), so I assume you'll have to do something similar.

Unfortunately I couldn't find a .Net equivalent function, sorry.