If I append node when filtering is applied and new node doesn't match to filtering, the data is displayed twice. If it matches, the node is not added.
$('#tg').treegrid('append',{data:[{"id":10,"name":"Java","persons":2,"begin":"3/11/2010","end":"3/18/2010","progress":80}]});
If I use filter and remove it, I can't append child node. Parent's icon is changed to folder but node is not added.
$('#tg').treegrid('append',{parent:3,data:[{"id":10,"name":"Java","persons":2,"begin":"3/11/2010","end":"3/18/2010","progress":80}]});