I woke up this morning and had a kinda cool feature in my head, but I am having some problems implementing it.
Some background information. I am designing a graphical custom thermometer control (a cylinder and bubble with a colored liquid inside it). I started this as an excersise to learn more about GDI+, but I also think I need it for a project <s>. Anywho, I added code so that I can click within the cylinder and the liquid level moves to the point I clicked.
Now to the feature. What if I could display a tooltip while hovering over the thermometer cylinder, the tooltip would change as I moved up and down and display the temperature for that particular point.

Currently I just set the tooltip up in the constructor something like this:

myToolTip = new ToolTip();
myToolTip.AutoPopDelay = 5000;
myToolTip.InitialDelay = 1000;
myToolTip.ReshowDelay = 500;
myToolTip.ShowAlways = true;
myToolTip.SetToolTip(this, "Temperature: ???°F");

Am I even on the right track? Can I change the tooltip text the way I am sugesting? Am I better off creating my own'form' that moves with the mouse cursor?

Any thoughts on the subject are appreciated.

Thanks,
Einar