private void AxRenderControl1_RcHTMLWindowMouseHover(int WinId, bool IsMouseHover) { IHTMLWindow htmWnd = this.axRenderControl1 as IHTMLWindow; IWindowParam wp = htmWnd.GetWindowParam(WinId); if (IsMouseHover) { wp.OffsetX -= 50; wp.OffsetY -= 100; wp.SizeX += 100; wp.SizeY += 100; } else { wp.OffsetX += 50; wp.OffsetY += 100; wp.SizeX -= 100; wp.SizeY -= 100; } htmWnd.SetWindowParam(wp); }