Bug 168172 Add the get() and set() functions of HideDetail parameter on IGroup
Add the get() and set() functions of HideDetail parameter on IGroup, and thus enable the hidedetail shifting on the Group through eventhandler.
engine/org.eclipse.birt.report.engine.tests/test/org/eclipse/birt/report/engine/api/script/element/ElementTest.java
binding.setExpression( "expression" );
		binding.setName( "name" );
		IListing item = new Listing( tableHandle );
		item.addDataBinding( binding );
		IDataBinding binding2 = StructureScriptAPIFactory
				.createDataBinding( );
		try
		{
			item.addDataBinding( binding2 );
			fail( );
		}
		catch ( ScriptException e )
		{
			
		}
		RowHandle rowHandle = (RowHandle) tableHandle.getFooter( )
				.getContents( ).get( 0 );
		IRow row = new Row( rowHandle );
		IHighlightRule highlight = StructureScriptAPIFactory
				.createHighLightRule( );
		row.addHighlightRule( highlight );
		IHideRule hideRule = StructureScriptAPIFactory.createHideRule( );
		item.addHideRule( hideRule );
		IFilterCondition filter = StructureScriptAPIFactory
				.createFilterCondition( );
		try
		{
			item.addFilterCondition( filter );
			fail( );
		}