@Override
protected Control createTreeAreaContents(Composite parent) {
Composite leftArea = new Composite(parent, SWT.NONE);
leftArea.setBackground(parent.getDisplay().getSystemColor(SWT.COLOR_LIST_BACKGROUND));
leftArea.setFont(parent.getFont());
GridLayout leftLayout = new GridLayout();
leftLayout.numColumns = 1;
leftLayout.marginHeight = 0;
leftLayout.marginTop = IDialogConstants.VERTICAL_MARGIN;
leftLayout.marginWidth = IDialogConstants.HORIZONTAL_MARGIN;
leftLayout.horizontalSpacing = 0;
leftLayout.verticalSpacing = 0;
leftArea.setLayout(leftLayout);
// Build the tree an put it into the composite.
TreeViewer viewer = createTreeViewer(leftArea);
setTreeViewer(viewer);
updateTreeFont(JFaceResources.getDialogFont());
GridData viewerData = new GridData(GridData.FILL_BOTH | GridData.GRAB_VERTICAL);
viewer.getControl().getParent().setLayoutData(viewerData);
layoutTreeAreaControl(leftArea);
return leftArea;
}
