how to get control inside splitcontainer?
((DataGridView)(Application.OpenForms["frmMasterInterface"].Controls["splitContainer1"].Controls["splitContainer1.Panel1"].Controls["pnlLeft"].Controls["grbfittingTypes"].Controls["dgvitems"])).Rows[RowIndex].Cells["sizeRange"].Value

SplitContainer sc = (SplitContainer)Application.OpenForms[0].Controls["splitContainer1"];
DataGridView dg = (DataGridView)sc.Panel1.Controls["dataGridView1"];

DataGridView dggg; //Globally Declared
private void dd()
{
    var form = (frmMasterInterface)Application.OpenForms["frmMasterInterface"];//Form Name
    if (form == null) return;
    foreach (DataGridView dgv in form.Controls.OfType<DataGridView>())
        if (dgv.Name == "dataGridView1") //name of data grid view
        {
            dggg = dgv;
            dgv.CellMouseClick += Datagirdmouseclick;
        }
}

private void Datagirdmouseclick(object sender, DataGridViewCellMouseEventArgs e)
{

    Trace.WriteLine(dggg.Rows[e.RowIndex].Cells["sizeRange"].Value);
}