Getting the middle of an object to snap to grid - how?

[Chris G <cl isbd net>]

I'm finding some of the component objects in dia (like the resistor
objects) very annoying to use because the centre of the the object
doesn't snap to grid.

I.e. if you get a resistor and shrink it to be fairly small then it's
the top edge of the resistor that snaps to the grid which is quite
useless when you have circuit wired on the grid as you can't connect the
wires to the resistor.

Is there any way to change the resistor (and other object's) properties
so that the centre of the object snaps to the grid?

-- 
Chris Green