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Message: [QUOTE="Teemu Keiski, post: 4258353"] I answered this on another group: It is because basically DataGrid's control hierarchy isn't "clear" yet, that is this item is just created and it hasn't been added to DataGrid's controls collection and therefore they have not been assigned full IDs yet. You could overcome the problem by attaching a handler for DataGrid's PreRender event and set the ID's there. My code is VB as I had VB IDE open by the time I read your question, hope it doesn't mind). Private Sub DataGrid1_PreRender(ByVal sender As Object, ByVal e As System.EventArgs) Handles DataGrid1.PreRender For Each dgi As DataGridItem In DataGrid1.Items Dim b As Button = CType(dgi.FindControl("b"), Button) Dim div As HtmlGenericControl = CType(dgi.FindControl("div"), HtmlGenericControl) Dim divClientID As String = div.ClientID Dim js As String = "javascript:setNewContent('" + divClientID + "');return false;" b.Attributes("onclick") = js Next End Sub And BTW it should work on ItemDataBound as well as on that phase item is added to the DataGrids controls. -- Teemu Keiski MCP,Designer/Developer Mansoft tietotekniikka Oy [URL]http://www.mansoft.fi[/URL] AspInsiders Member, [URL="http://www.aspinsiders.com"]www.aspinsiders.com[/URL] ASP.NET Forums Moderator, [URL="http://www.asp.net"]www.asp.net[/URL] AspAlliance Columnist, [URL="http://www.aspalliance.com"]www.aspalliance.com[/URL] [/QUOTE]