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
dataSourceLabel.setLayoutData( data );
		}
		availableDbObjectsTree = new Tree( tablescomposite, SWT.BORDER
				| SWT.MULTI );
		{
			GridData data = new GridData( GridData.FILL_BOTH );
			data.grabExcessHorizontalSpace = true;
			data.grabExcessVerticalSpace = true;
			data.heightHint = 150;
			availableDbObjectsTree.setLayoutData( data );
		}
		availableDbObjectsTree.addMouseListener( new MouseAdapter( ) {
			public void mouseDoubleClick( MouseEvent e )
			{
				populateEventData( e );
				insertText( (String) e.data );
			}
		} );
		availableDbObjectsTree.addSelectionListener( new SelectionAdapter( ) {
			public void widgetSelected( SelectionEvent event )
			{
				if ( event.widget.getClass( ) != null )
					handleAvailabeTreeSelection( );
			}
			private void handleAvailabeTreeSelection( )
			{
				TreeItem items[] = availableDbObjectsTree.getSelection( );
				for ( int i = 0; i < items.length; i++ )
				{
					if ( items[i].getGrayed( ) )