How to hide the dimension inside AxisElementBuilder?

protected void Page_Load(object sender, EventArgs e)
{
    this.OlapClient1.PreRender += OlapClient1_PreRender;
}
void OlapClient1_PreRender(object sender, EventArgs e)
{
    if (this.OlapClient1.AxisElementBuilderSlicer.Controls.Count > 0 && this.OlapClient1.AxisElementBuilderSlicer.Controls[0].Controls.Count > 0 && this.OlapClient1.AxisElementBuilderSlicer.Controls[0].Controls[0] is Label)
    {
        for (var i = 0; i < this.OlapClient1.AxisElementBuilderSlicer.Controls.Count; i++)
        {
           if (!(OlapClient1.AxisElementBuilderSlicer.Controls[i] is SplitButton))        continue;
           if (((Label)OlapClient1.AxisElementBuilderSlicer.Controls[i].Controls[0]).Text == "Date")
           {
                OlapClient1.AxisElementBuilderSlicer.Controls[i].Visible = false;
           }
        }
    }
}

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
                AddHandler Me.OlapClient1.PreRender, AddressOf OlapClient1_PreRender
End Sub
Private Sub OlapClient1_PreRender(ByVal sender As Object, ByVal e As EventArgs)
                If Me.OlapClient1.AxisElementBuilderSlicer.Controls.Count > 0 AndAlso Me.OlapClient1.AxisElementBuilderSlicer.Controls(0).Controls.Count > 0 AndAlso TypeOf Me.OlapClient1.AxisElementBuilderSlicer.Controls(0).Controls(0) Is Label Then
                                For i = 0 To Me.OlapClient1.AxisElementBuilderSlicer.Controls.Count - 1
                                   If Not(TypeOf OlapClient1.AxisElementBuilderSlicer.Controls(i) Is SplitButton) Then
                                   Continue For
                                   End If
                                   If (CType(OlapClient1.AxisElementBuilderSlicer.Controls(i).Controls(0), Label)).Text = "Date" Then
                                                                OlapClient1.AxisElementBuilderSlicer.Controls(i).Visible = False
                                   End If
                                Next i
                End If
End Sub