private void svg_click(int Par_ID) { TreeItem Curr_Item = LocalData.dynamic_List.Single(x => x.Tree_ID == Par_ID); if (Curr_Item.Tree_HasChildren) { Curr_Item.Tree_IsExpanded = !Curr_Item.Tree_IsExpanded; LocalTreeFunctions.Cmd_ChangeVisibility(Curr_Item.Tree_ID, Curr_Item.Tree_IsExpanded, true); } }