How can I show a tooltip on a disabled button?

Place the button (or any control that fits this scenario) in a container (panel, tableLayoutPanel), and associate the tooltip to the appropriate underlying panel cell. Works great in a number of scenarios, flexible. Tip: make the cell just large enough to hold the bttn, so mouseover response (tooltip display) doesn't appear to "bleed" outside the bttn borders.

I have since adapted BobbyShaftoe's answer to be a bit more general

Notes:

• The MouseMove event must be set on the parent control (a panel in my case)

  private void TimeWorks_MouseMove(object sender, MouseEventArgs e)
  {
      var parent = sender as Control;
      if (parent==null)
      {
          return;
      }
      var ctrl = parent.GetChildAtPoint(e.Location);
      if (ctrl != null && !ctrl.Enabled)
      {
          if (ctrl.Visible && toolTip1.Tag==null)
          {
              var tipstring = toolTip1.GetToolTip(ctrl);
              toolTip1.Show(tipstring, ctrl, ctrl.Width / 2, ctrl.Height / 2);
              toolTip1.Tag = ctrl;
          }
      }
      else
      {
          ctrl = toolTip1.Tag as Control;
          if (ctrl != null)
          {
              toolTip1.Hide(ctrl);
              toolTip1.Tag = null;
          }
      }
  
  }