public override ToolTipControlInfo GetToolTipInfo(Point point)
        {
            ToolTipControlInfo resInfo = base.GetToolTipInfo(point);

            RepositoryItemMyRadioGroup ri = Item as RepositoryItemMyRadioGroup;
            if (ri.OwnerEdit != null)
            {
                for (int itemIndex = 0; itemIndex < Item.Items.Count; itemIndex++)
                {
                    Rectangle rect = ri.OwnerEdit.GetItemRectangle(itemIndex);
                    if (rect.Contains(point) && ri.Items[itemIndex].ToolTip != string.Empty)
                    {
                        resInfo = null;
                        resInfo = new ToolTipControlInfo(itemIndex, ri.Items[itemIndex].ToolTip);
                    }
                }
            }

            return resInfo;
        }
 static MyRadioGroup()
 {
     RepositoryItemMyRadioGroup.RegisterMyRadioGroup();
 }