Bug 122412 Need a scroll bar to display the full description in expression builder
Description: Need a scroll bar to display the full description in expression builder Step to reproduce: 1.Open the expression builder, choose BIRT JS Object->Total Expected result: All the methods and description could be displayed.Since we can't resize the dialog of expression builder, a scroll bar is needed Actual result: The methods and description are truncated due to the limited space (see the sreenshot in attachment)
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/ExpressionBuilder.java
*/
	public ExpressionBuilder( String initExpression )
	{
		this( UIUtil.getDefaultShell( ), initExpression );
	}
	/**
	 * Create an expression builder under the default parent shell without an
	 * initail expression
	 * 
	 */
	public ExpressionBuilder( )
	{
		this( null );
	}
	protected Control createDialogArea( Composite parent )
	{
		Composite composite = (Composite) super.createDialogArea( parent );
		createToolbar( composite );
		createExpressionField( composite );
		if ( provider == null )
		{
			provider = new ExpressionProvider( );
		}
		createOperatorsBar( composite );
		createListArea( composite );
		return composite;
	}
	private void createToolbar( Composite parent )
	{
		ToolBar toolBar = new ToolBar( parent, SWT.FLAT );