ASP.NET GridView Multiple Edit Rows At Same Time

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In ASP.NET 4.0 GridView, is it possible to have multiple rows in edit mode at the same time?I'm controlling the rows with edit mode in a property:\[code\]Private Property Editing As List(Of Integer) Get If ViewState("Editing") Is Nothing Then ViewState("Editing") = New List(Of Integer) Return CType(ViewState("Editing"), List(Of Integer)) End Get Set(value As List(Of Integer)) ViewState("Editing") = value End SetEnd Property\[/code\]Populating it when the user clicks on edit button:\[code\]Protected Sub GridView1_RowCommand(sender As Object, e As System.Web.UI.WebControls.GridViewCommandEventArgs) Handles GridView1.RowCommand If e.CommandName = "Edit" Then Dim row = CType(CType(e.CommandSource, LinkButton).NamingContainer, GridViewRow) Editing.Add(row.RowIndex) End IfEnd Sub\[/code\]And changing the RowState property manually in the RowDataBound event:\[code\]Protected Sub GridView1_RowDataBound(sender As Object, e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles GridView1.RowDataBound If e.Row.RowType = DataControlRowType.DataRow Then If Editing.Contains(e.Row.RowIndex) Then Then e.Row.RowState = DataControlRowState.Edit End If End IfEnd Sub\[/code\]But it's not working, the rows is being rendered in the normal state... any ideias?