why datagrid_SelectedIndexChanged doesn't work the first time

I must say that I changed the linkbutton, now it's on the datagrid in design time, not in execution time, and now it works. Any way, here is the code I used before (I put only what I think neccesary, if u need ALL the code just say it please) The first time the execution doesn't enter into the function dgMuestras_SelectedIndexChanged. Now it works, don't waste your time if you don't want, now it's just a curiosity (for me) what could be happening. Thanx! private void dgMuestras_SelectedIndexChanged(object sender, System.EventArgs e) { txbVersion.Text = dgMuestras.SelectedItem.Cells[4].Text; txbReferencia.Text = dgMuestras.SelectedItem.Cells[2].Text; txbnmaterial.Text = dgMuestras.SelectedItem.Cells[3].Text; txbFichero.Text = dgMuestras.SelectedItem.Cells[6].Text; txbResumen.Text = dgMuestras.SelectedItem.Cells[9].Text; ddlIdioma.SelectedValue = dgMuestras.SelectedItem.Cells[7].Text; ddlPeligrosidad.SelectedValue = dgMuestras.SelectedItem.Cells[8].Text; txbFecha.Text = dgMuestras.SelectedItem.Cells[5].Text; } private void Page_Load(object sender, System.EventArgs e) { if (!this.IsPostBack) { this.lblUsuario.Text = BBDD.Usuario(User.Identity.Name); BBDD.loadDropDownList(ddlIdioma, "idioma", "ididioma", "sdescripcion"); BBDD.loadDropDownList(ddlPeligrosidad, "peligrosidad", "idpeligrosidad", "sdescripcion"); } btnSalir.CausesValidation = btnNuevo.CausesValidation = btnCancelar.CausesValidation = btnBuscar.CausesValidation = false; if (dgMuestras.Visible) { arreglaGrid(); arreglaDades(); } } private void arreglaDades(){ for (int i=1; i

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