how to make my textbox focus in an editable datagrid?

Question

there is my code for update command.. Public Sub DataUpdate(ByVal Sender As Object, ByVal E As DataGridCommandEventArgs) If CheckTime(CType(E.Item.FindControl("txtStd"), TextBox).Text) = "Error" Then Response.Write(msgbox("Invalid Input!!")) setFocus(CType(E.Item.FindControl("txtStd"), TextBox)) Exit Sub End If end sub here is my setfocus functions.. Private Sub setFocus(ByVal ctrl As System.Web.UI.Control) Dim s As String = "" RegisterStartupScript("focus", s) End Sub the setfocus function is working properly when the control is outside the datagrid.. but i cant make it focus in my editable datagrid.. anyone knows what's going wrong??