//TreeData data = (TreeData)_tree.getSelection()[0].getData();
//data.getElement().detach();
_dom.setChanged(true);
((SchedulerDom)_dom).setChangedForDirectory("job_chain", Utils.getAttributeValue("name", elem), SchedulerDom.DELETE);
elem.detach();
TreeItem parentItem = _tree.getSelection()[0].getParentItem();
_tree.setSelection(new TreeItem[]{parentItem});
if(parentItem.getItemCount() == 1)//job_chains Element hat keine weiteren Kindelemente
((TreeData)parentItem.getData()).getElement().getChild("job_chains").detach();
_gui.updateJobChains();