layoutData.horizontalAlignment = GridData.FILL;
layoutData.verticalAlignment = GridData.FILL;
sash.setLayoutData(layoutData);
tree = new Tree(sash, SWT.FULL_SELECTION | SWT.MULTI);
tooltip.install(tree);
tree.setHeaderVisible(true);
Listener sortListener = new PyUnitSortListener(this);
colIndex = createColumn(" ", 50, sortListener);
colResult = createColumn("Result", 70, sortListener);