Tooltips and MouseMove event

I am drawing an array of circles, boxes, etc., on a graphics object
associated with a panel control.  The class I use to do this is called
'Cartridge'.  So one of the items in the constructor of the Cartridge
object is a panel control (though technically it could be any control to
which I can get a reference to a graphics object) I am referring to as
_canvas.

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Anyway, I have realized that it would be very beneficial to provide
tooltips when the mouse hovers over some of the shapes I have drawn.  To
try to implement this, I have created a ToolTip object in the Cartridge
class and have attempted to set it in two places - first, an event
handler connected to the _canvas.MouseMove() event; second, in an event
handler connected to the _canvas.MouseHover() event.  Neither produces
the desired effect.

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The MouseMove() event seems to fire at intervals of about 500 ms
regardless of whether or not I am moving the Mouse over the _canvas.
The MouseHover() event never (very, very seldom) seems to fire.

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Any suggestions on what I can do to implement this tooltip
functionality?

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Peter

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