Problema com Editar do Gridview

Tenho o seguinte gridview, para edita-lo ou mesmo atualiza-lo depois estou tendo que clicar duas vezes em editar ou em atualizar, o que estou fazendo de errado? O gridview é preenchido após selecionar uma opção no combo e clicar em um imagebutton

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<asp:GridViewID="GridView1"runat="server"AllowSorting="True"

AutoGenerateColumns="False"CellPadding="4"DataKeyNames="id"

ForeColor="#333333"PageSize="30"style="font-family: Arial; font-size: x-small">

<RowStyleBackColor="#EFF3FB"HorizontalAlign="Left"/>

<Columns>

<asp:BoundFieldDataField="id"HeaderText="id"InsertVisible="False"ReadOnly="True"SortExpression="id"Visible="false"/>

<asp:BoundFieldDataField="re"HeaderText="RE"SortExpression="re"ReadOnly="True"/>

<asp:CheckBoxFieldDataField="aceite"HeaderText="Aceitar"/>

<asp:CommandFieldHeaderText="Editar"ShowEditButton="True"/>

</Columns>

<FooterStyleBackColor="#507CD1"Font-Bold="True"ForeColor="White"/>

<PagerStyleBackColor="#2461BF"ForeColor="White"HorizontalAlign="Center"/>

<SelectedRowStyleBackColor="#D1DDF1"Font-Bold="True"ForeColor="#333333"/>

<HeaderStyleBackColor="#507CD1"Font-Bold="True"ForeColor="White"HorizontalAlign="Left"/>

<EditRowStyleBackColor="#93B6EA"/>

<AlternatingRowStyleBackColor="White"/>

</asp:GridView>

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ProtectedSub GridView1_RowEditing(ByVal sender AsObject, ByVal e As System.Web.UI.WebControls.GridViewEditEventArgs) Handles GridView1.RowEditing

'Set the edit index.

GridView1.EditIndex = e.NewEditIndex

EndSub

ProtectedSub GridView1_RowUpdating(ByVal sender AsObject, ByVal e As System.Web.UI.WebControls.GridViewUpdateEventArgs) Handles GridView1.RowUpdating

SqlDataSource1.Update()

GridView1.EditIndex = -1

EndSub

ProtectedSub GridView1_RowCancelingEdit(ByVal sender AsObject, ByVal e As System.Web.UI.WebControls.GridViewCancelEditEventArgs) Handles GridView1.RowCancelingEdit

GridView1.EditIndex = -1

EndSub