Infragistics Error When Closing Form

When using the Infragistics grid control on a windows form, user sometimes gets the following error message: "ExceptionMsg=System.InvalidCastException: Unable to cast object of type 'Infragistics.Win.ToolTipFormEx' to type 'xxxx'."

This is due to a bug in the Infragistics grid.

The fix is to dispose of the grid object in the FormClosing() event of the form.

private void MyForm_FormClosing(object sender, FormClosingEventArgs e)
{
   if (this.myGrid != null)
   {
      this.myGrid.Dispose();
   }
}