invoking the event of one class to another class of grid event

class class1
{
public void RefreshParameter()
        {
            gcUnitPRMS.ProcessGridKey += new KeyEventHandler(gcUnitPRMS_ProcessGridKey);

           // gcUnitPRMS.ProcessGridKey += new KeyEventHandler(gcUnitPRMS_ProcessGridKey);
        }

        public void gcUnitPRMS_ProcessGridKey(object sender, KeyEventArgs e)
        {
            GridControl grid = (GridControl)sender;
            GridView view = (GridView)grid.FocusedView;

            if (view.Name != "gvUnitPRMs")
                return;

            DataRowView master = (DataRowView)view.SourceRow;
            if (Convert.ToString(master["TypeCategory"]) == Categories.sUnitParameters)
                return;

            if (e.KeyCode == Keys.Enter)
            {
                if (!view.IsEditing)
                {

                    if (view.UpdateCurrentRow())
                    {

                        AddNewPRMRow(view);
                    }
                }
            }
            else if (e.KeyCode == Keys.Delete)
            {
                if (!view.IsEditing)
                {
                    DialogResult res = XtraMessageBox.Show("Are You Sure To Delete", "Warning", MessageBoxButtons.YesNo, MessageBoxIcon.Warning);
                    if (res == DialogResult.Yes)
                    {

                        DeletePRMRow(view);
                    }
                }
            }
            AddNewPRMRow(view);
            int rhandle = view.FocusedRowHandle;
            GridColumn gcol = view.Columns["unit_param_desc"];
            view.SetFocusedRowCellValue(gcol, description1);
           
        }
}
class class2
{
class1 cs=new class1();
private void treeList1_AfterFocusNode(object sender, NodeEventArgs e)
    {
        TreeList tr1 = sender as TreeList;
        if (e.Node.ParentNode != null)
        {
            parameter.description = e.Node.GetValue("OPCName").ToString();
            if (e.Node.ParentNode.ParentNode != null)
            {
 cs.servername1 = e.Node.ParentNode.ParentNode.GetValue("OPCName").ToString();
    cs.host1 = e.Node.ParentNode.ParentNode.GetValue("OPCIPAddress").ToString();
                cs.RefreshParameter();
            }

        }      

    }

}