Bug 136538 chart cannot inherite table's columns binding when drag into table's group header
steps to reproduce: - create a table - define columns binding - insert a group - drag a chart into table's group header expected behavior: - chart can inherite table's columns binding actual behavior: - it simply couldn't
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/editors/schematic/extensions/ExtendedElementToolExtends.java
{
	private String extensionName;
	/**
	 * @param builder
	 */
	public ExtendedElementToolExtends( String extensionName )
	{
		super( );
		this.extensionName = extensionName;
	}
	public boolean preHandleMouseUp( )
	{
		
		
		
		
		ExtendedItemHandle handle = DesignElementFactory.getInstance( )
				.newExtendedItem( null, extensionName );
		if ( handle == null )
		{
			return false;
		}
		IReportItemBuilderUI builder = getbuilder( );
		if ( builder != null )
		{