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
/**
	 * 
	 * @param item
	 */
	private void selectNode(TreeItem item)
	{
		TreeItem[] selectedItem = new TreeItem[1];
		selectedItem[0] = item;
		availableDbObjectsTree.setSelection(selectedItem);
		availableDbObjectsTree.setFocus();
	}
	/**
	 * @param schemaRs:
	 *            The ResultSet containing the List of schema
	 * @return A List of schema names
	 */
	private ArrayList getAllSchemaList( ResultSet schemaRs )
	{
		if ( schemaRs == null )
		{
			return null;
		}
		ArrayList allSchemas = new ArrayList( );
		try
		{
			while ( schemaRs.next( ) )
			{
				allSchemas.add( schemaRs.getString( "TABLE_SCHEM" ) );
			}
		}