mapx实现热点效果

        当鼠标移动到图元上方时，标注改变样式（变色，加下划线等），移开后还原。通过vb+mapx基本实现这个效果，但由于mapx在label进行变化时的刷新很明显，达不到希望的效果。把代码留下。

Private Sub Map1_MouseMove(Button As Integer, Shift As Integer, x As Single, y As Single)
     'StatusBar1.Panels(1).Text = X & "," & Y
     Dim Lon As Double
     Dim lat As Double
     Dim fs As Features
     Dim pnt As New Point
     Dim lb As MapXLib.Label  '±ê×¢¶ÔÏó
     Map1.ConvertCoord x, y, Lon, lat, miScreenToMap
     pnt.Set Lon, lat
     Set fs = Map1.Layers(PLayer).SearchAtPoint(pnt)
     If fs.Count > 0 Then     '¶¨Î»¶ÔÏó
       If Not curftr Is Nothing Then If curftr = fs.Item(1) Then Exit Sub  '·ÀÖ¹Öظ´ÉèÖÃ
       Set lb = GetLabel(fs.Item(1).FeatureKey, Map1.Layers(PLayer).Labels)
       If Not lb Is Nothing Then             'Ϊ±ê×¢¼ÓÏ»®ÏßЧ¹û
         lb.Style.TextFont.Underline = True
         Set curftr = fs.Item(1)
         'fs.Item(1).Update
       End If
       Map1.MousePointer = miCustomCursor    'Êó±êÑùʽ
     Else
       If Not curftr Is Nothing Then  '»¹Ô­Ï»®Ïß״̬
         Set lb = GetLabel(curftr.FeatureKey, Map1.Layers(PLayer).Labels)
         lb.Style.TextFont.Underline = False
         'curftr.Update
         Set curftr = Nothing
         Frame1.Visible = False   'Òþ²Øµ¯³ö²Ëµ¥
       End If
       Map1.MousePointer = miArrowCursor
     End If
 End Sub