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Prevent color flashing

I'm writing my first IDL widget program.  I have various editions
of the IDL manuals and also David Fanning's book.  I'm plugging
along, learning lots of useful things.  There's one annoying thing
I haven't been able to figure out.  I have a drawing window, and
I'm using it to display simple monochrome PLOT output.  This is
running on machine with an 8-bit display, so IDL uses a private color
table.  The colors flash in the most annoying way when the cursor
moves in and out of the IDL window.  Is there some way to prevent this?

*   Patrick L. Nolan         
*   W. W. Hansen Experimental Physics Laboratory (HEPL)       * 
*   Stanford University                                       *