Bug 126061 [Viewers] Need to document that virtual tables and trees ignore sorters and filters
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/TreeViewer.java
if (prov instanceof ITableLabelProvider) {
			tprov = (ITableLabelProvider) prov;
		}
		
		if (prov instanceof ITreePathLabelProvider) {
			pprov = (ITreePathLabelProvider) prov;
		}
		
		
		int columnCount = tree.getColumnCount();
		if (columnCount == 0) {
								
			ViewerLabel updateLabel = new ViewerLabel(treeItem.getText(),
					treeItem.getImage());
			if (pprov != null) {
				TreePath path = getTreePathFromItem(item);
				buildLabel(updateLabel,path,pprov);
			} else 
				if(vprov != null) {
					buildLabel(updateLabel,element,vprov);
				} else{
					if(lprov != null) {
						buildLabel(updateLabel,element,lprov);
					}
				}
			
			
			if (treeItem.isDisposed()) {
				unmapElement(element, treeItem);