private void C_UNSET_GROUP_BUTTON_Click(object sender, RoutedEventArgs e)
        {
            var dc    = ((Button)sender).DataContext;
            var item  = (Model.TrickerStarGroupModel)dc;
            var nodes = C_MAIN_NODE_VIEW.TS_GetSelectedNodes();

            foreach (String node_name in nodes)
            {
                m_NodeGroup.Remove(node_name);
            }
        }
        private void C_SET_GROUP_BUTTON_Click(object sender, RoutedEventArgs e)
        {
            var dc    = ((Button)sender).DataContext;
            var item  = (Model.TrickerStarGroupModel)dc;
            var nodes = C_MAIN_NODE_VIEW.TS_GetSelectedNodes();

            foreach (String node_name in nodes)
            {
                m_NodeGroup[node_name] = new Model.TrickerStarGroupModel()
                {
                    GroupName  = item.GroupName,
                    GroupTitle = item.GroupTitle,
                };
            }
        }