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
}
				}
				else
					return;
			}
		}
		
		 
		
		RemoveAllAvailableDbObjects( );
		setRootElement( );
		setRefreshInfo( );
		if ( isSchemaSupported )
		{
			populateSchemaList( );
		}
		else
		{
			populateTableList( );
		}
		addFetchDbObjectListener( );  
		
		
		if( rootNode != null )
		{
			selectNode(rootNode);
		}
	}
	
	/**