Bug 210609 [Smoke]Crosstab is failed to preview in runtime
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/extension/ExtendedEditPart.java
refreshBorder( (DesignElementHandle) getModel( ), new LineBorder( ) );
		( (AbstractGraphicalEditPart) getParent( ) ).setLayoutConstraint( this,
				getFigure( ),
				getConstraint( ) );
	}
	/**
	 * @return The constraint
	 */
	protected Object getConstraint( )
	{
		ExtendedItemHandle handle = getExtendedItemHandle( );
		ReportItemConstraint constraint = new ReportItemConstraint( );
		String type = handle.getPrivateStyle( ).getDisplay( );
		if ( type == null )
		{
			type = DesignChoiceConstants.DISPLAY_BLOCK;
		}
		constraint.setDisplay( type );
		constraint.setMargin( getModelAdapter( ).getMargin( null ) );
		return constraint;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.gef.editparts.AbstractGraphicalEditPart#createFigure()
	 */
	protected IFigure createFigure( )
	{
		return getExtendedElementUI( ).createFigure( getExtendedItemHandle( ) );
	}