Bug 177405 [Preferences] Layout issues with Text Boxes and Scrollbars
bundles/org.eclipse.jface/src/org/eclipse/jface/preference/PreferenceDialog.java
*/
	protected Control createDialogArea(Composite parent) {
		final Composite composite = (Composite) super.createDialogArea(parent);
		GridLayout parentLayout = ((GridLayout) composite.getLayout());
		parentLayout.numColumns = 4;
		parentLayout.marginHeight = 0;
		parentLayout.marginWidth = 0;
		parentLayout.verticalSpacing = 0;
		parentLayout.horizontalSpacing = 0;
		
		composite.setBackground(parent.getDisplay().getSystemColor(SWT.COLOR_LIST_BACKGROUND));
		
		Control treeControl = createTreeAreaContents(composite);
		createSash(composite,treeControl);
		
		Label versep = new Label(composite, SWT.SEPARATOR | SWT.VERTICAL);
		GridData verGd = new GridData(GridData.FILL_VERTICAL | GridData.GRAB_VERTICAL);
	
		versep.setLayoutData(verGd);
		versep.setLayoutData(new GridData(SWT.LEFT, SWT.FILL, false, true));
		
		Composite pageAreaComposite = new Composite(composite, SWT.NONE);
		pageAreaComposite.setLayoutData(new GridData(GridData.FILL_BOTH));
		GridLayout layout = new GridLayout(1, true);
		layout.marginHeight = 0;
		layout.marginWidth = 0;
		layout.verticalSpacing = 0;
		pageAreaComposite.setLayout(layout);
		
		formTitleComposite = new Composite(pageAreaComposite, SWT.NONE);