Bug 136279 Structure and table datatypes should be hidden.
Description: Structure and table datatype should be hidden. Steps to reproduce: In table data binding, I saw structure and table two datatypes. They are not supported now, so they should be removed.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/wizards/WizardTemplateChoicePage.java
if ( key == null || "".equals( key.trim( ) ) )
			{
				img = ReportPlatformUIImages.getImage( IReportGraphicConstants.ICON_TEMPLATE_NO_PREVIEW );
			}
			else
			{
				img = imageMap.get( key );
				if ( img == null )
				{
					img = ReportPlugin.getImage( key );
					imageMap.put( key, img );
				}
			}
			previewCanvas.clear( );
			previewCanvas.loadImage( ( (Image) img ) );
			previewCanvas.showOriginal( );
			chkBox.setEnabled( !( ( (Template) templates.get( selectedIndex ) ).getCheatSheetId( )
					.equals( "" ) || ( (Template) templates.get( selectedIndex ) ).getCheatSheetId( )
					.equals( "org.eclipse.birt.report.designer.ui.cheatsheet.firstreport" ) ) ); 
		}
	};
	/**
	 * @return Returns the templates of selected item.
	 */
	public Template getTemplate( )
	{
		return (Template) templates.get( selectedIndex );
	}
	/**
	 * @return Returns the blank report template.