Metro框架组合框drawItem事件

Question

我对MetroFramework ComboBox使用DrawItem事件有问题。以前，我使用的是默认的vb 2015 system.windows.form.ComboBox，并且DrawItem事件正在运行，并且在使用MetroFramework之后不会触发DrawItem事件。

Private Sub ComboBox_Counter_DrawItem(ByVal sender As System.Object,
                               ByVal e As System.Windows.Forms.DrawItemEventArgs) _
                               Handles ComboBox_Counter.DrawItem

    On Error Resume Next
    MsgBox("Here")
    e.DrawBackground()
    Dim drv As DataRowView = CType(ComboBox_Counter.Items(e.Index), DataRowView)


    Dim id As Integer = drv("counterNo").ToString()
    Dim name As String = drv("description").ToString()
    Dim r1 As Rectangle = e.Bounds
    r1.Width = r1.Width / 6


    Using sb As SolidBrush = New SolidBrush(e.ForeColor)

        e.Graphics.DrawString(id, e.Font, sb, r1)

    End Using


    Using p As Pen = New Pen(Color.Black)
        e.Graphics.DrawLine(p, r1.Right, 0, r1.Right, r1.Bottom)
    End Using

    Dim r2 As Rectangle = e.Bounds
    r2.X = e.Bounds.Width / 6
    r2.Width = r2.Width '/ 2


    Using sb As SolidBrush = New SolidBrush(e.ForeColor)
        e.Graphics.DrawString(name, e.Font, sb, r2)
    End Using
End Sub