Bug 153387 Database item can't be dragged and dropped onto editor field
Steps to reproduce: 1.Start up BIRT in Mac OS X; 2.File->New->Project; 3.File->New->Report Design; 4.In Data Explorer, create a New Data Source, and choose "Classic Models Inc. Sample DataBase", press "Next" and then press "finish"; 5.In Data Explorer, create a New Data Set, press "Next"; 6.In the popup window, expand the "CLASSICMODELS", select and drag a item onto the editor field at right side.
data/org.eclipse.birt.report.data.oda.jdbc.ui/src/org/eclipse/birt/report/data/oda/jdbc/ui/editors/SQLDataSetEditorPage.java
* 
	 */
	private void initializeControl( )
	{
		DEFAULT_MESSAGE = JdbcPlugin.getResourceString( "dataset.new.query" );
		setMessage( DEFAULT_MESSAGE, IMessageProvider.NONE );
		refreshPage( );
		prepareUI( );
	}
	
	/**
	 * Creates the composite, for displaying the list of available db objects
	 * 
	 * @param parent
	 */
	private void createTableSelectionComposite( Composite parent )
	{
		Composite tablescomposite = new Composite( parent, SWT.NONE );
		GridLayout layout = new GridLayout( );
		tablescomposite.setLayout( layout );
		{
			GridData data = new GridData( GridData.FILL_BOTH );
			data.grabExcessVerticalSpace = true;
			tablescomposite.setLayoutData( data );
		}
		
		Label dataSourceLabel = new Label( tablescomposite, SWT.LEFT );
		dataSourceLabel.setText( JdbcPlugin.getResourceString( "tablepage.label.availableItems" ) );
		{
			GridData data = new GridData( );