If just setting the background and font color to accentuate it (using, for instance, light yellow - dark blue, black - white and/or other pairs that have big contrast) is not enough for you... what do you want to do?
To make it "shining" would mean having solid colors, implementing a "white" spark that moves around the area, changing gamma/brightness and/or a lot of other possibilities, depending on the result you want to get. But this (in my opinion) would make it much more complicated than needed.
If even that, you want to make it you will probably need to have a look
MSDN GDI+ info[
^]
another possibility could be creating your own shining *.gif and add it to your dialog as
Adding GIF-animation using GDI+[
^] explain
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