Can I show ToolTip for the nodes I am painting on a panel?

Question

I have a mesh system for a MMO and it's uses A* to find paths. Occasionally it fails because I have nodes that are badly placed. To fix this, I made a mesh visualiser. It works OKish - I can see that some nodes are badly placed. But I can't see which nodes.

Here is my code to show the nodes:

    foreach (var node in FormMap.Nodes)
    {

        var x1 = (node.Point.X * sideX);
        var y1 = (node.Point.Y * sideY);

        var x = x1 - nodeWidth / 2;
        var y = y1 - nodeWidth / 2;

        var brs = Brushes.Black;
        //if (node.Visited)
        //    brs = Brushes.Red;
        if (node == FormMap.StartNode)
            brs = Brushes.DarkOrange;
        if (node == FormMap.EndNode)
            brs = Brushes.Green;
        g.FillEllipse(brs, (float)x, (float)y, nodeWidth, nodeWidth);

I know I can redo this and make thousands of small buttons and add events for them but that seems overkill.

Is there any way I can add tooltips to the nodes I am painting on the panel?