Increasing size of TBitmap

I have a TBitmap on my form (both autosize and stretch are false).
Its width and height are 100 pixels. I also use its canvas to draw
on. Now I want to dynamically increase the width and height (e.g.
when resizing my form) but no can do. The drawable area of the
canvas remains 100x100..

How can I resolve this? Stretch doesn't work because this only
makes the pixels "bigger" but doesn't give me more pixels..

Any hints?

cheers,

Bram
.

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