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
{
			return true;
		}
		else
		{
			return false;
		}
	}
	
	/**
	 * Sets the Root Element of the Available Data Sources This is usually the
	 * Name of the Catalog of the Database
	 */
	protected void setRootElement( )
	{
		rootNode = new TreeItem( availableDbObjectsTree, SWT.NONE );
		rootNode.setImage( dataBaseImage );
		DataSourceDesign dataSourceHandle = this.getDataSetDesign( )
				.getDataSourceDesign( );
		rootNode.setText( dataSourceHandle.getName( ) );
	}
	
	/**
	 * Remove all available db objects
	 * 
	 */
	private void RemoveAllAvailableDbObjects( )
	{
		if ( availableDbObjectsTree != null )
			availableDbObjectsTree.removeAll( );