各位大俠,請指教!我在調用子窗口時,有出理重影的情況.不知怎樣解決.注,不是每個窗口的都有重影,有其中一個或兩個有重影現象.但寫法完全一樣.

先定義屬性
#Region "PROD_F Initalizing Property"
    Private Shared PROD_F1 As PROD_F
    Private Shared InitalizingDefInstance As Boolean
    Public Shared Property DefInstance() As PROD_F
        Get
            If PROD_F1 Is Nothing OrElse PROD_F1.IsDisposed Then
                InitalizingDefInstance = True
                PROD_F1 = New PROD_F()
                InitalizingDefInstance = False
            End If
            DefInstance = PROD_F1
        End Get
        Set(ByVal Value As PROD_F)
            PROD_F1 = DefInstance
        End Set
    End Property
#End Region

再調用窗口
     PROD_F.DefInstance.MdiParent = Me
        PROD_F.DefInstance.Show()