* @param style The SWT style to use
* @return A viewer for the file tree
*/
private CheckboxTreeViewer createCheckboxTreeViewer(Composite parent, int style) {
treeViewer = new CheckboxTreeViewer(parent, style);
treeViewer.setLabelProvider(new GenericAssetLabelProvider());
treeViewer.setAutoExpandLevel(2);
// Add a sorter which sorts the files according to the locale's
// collation, and which also sorts directories before files.
// There is also a public int category(Object node) method