void handleActionSetViewerKeyPressed(KeyEvent event) {
// popup the description for the selected action set
if (event.keyCode == SWT.F2 && event.stateMask == 0) {
IStructuredSelection sel = (IStructuredSelection) actionSetsViewer
.getSelection();
ActionSetDescriptor element = (ActionSetDescriptor) sel
.getFirstElement();
if (element != null) {
String desc = element.getDescription();
if (desc == null || desc.equals("")) { //$NON-NLS-1$
desc = WorkbenchMessages.ActionSetSelection_noDesc;
}
actionSetsViewerTooltip.setText(desc);
// Passing 0,0 because tooltip is always opened on current cursor position