Brush.Bitmap problems

Hi,

does anyone know why:

PaintBox1.Canvas.Brush.Bitmap := nil;
PaintBox1.Canvas.Brush.Color := clRed;
PaintBox1.Canvas.Rectangle(Rect(0,0,200,200));

doesn't work as I would expect?

I'm assigning the brush.bitmap as nil[1] because I have no way of knowing what 
state it is in before this code runs, and I want to draw a simple filled 
rectangle.

Without the bitmap := nil assignment, the rectangle draws as a filled object 
correctly, but when I unassign the bitmap value, the rectangle draws, but 
without a fill value.  IE it behaves as if I had used Polygon instead of 
Rectangle... 

Why does the brush fail when assigning, even an already nil, bitmap the value 
of nil?

[1] in the production code I'm keeping a reference to the initial bitmap 
value, and reassigning it after at the end of the procedure. 

-- 
adam

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