Bug 194843 Cross tab Cube - Cannot delete a dimension using the cube builder
- Open the attached report design - Delete the "Region" group. Current behavior - Does now allow me to delete the group.
model/org.eclipse.birt.report.model.tests/test/org/eclipse/birt/report/model/command/ContentCommandTest.java
FreeFormHandle form = designHandle.getElementFactory( ).newFreeForm(
				"form2" ); 
		designHandle.getBody( ).add( form );
		form.setStyle( style );
		assertNotNull( form.getStyle( ) );
		ContentCommand command = new ContentCommand( design,
				new ContainerContext( design, IReportDesignModel.STYLE_SLOT ) );
		command.remove( style.getElement( ) );
		assertNull( form.getStyle( ) );
		
		
		TableHandle table = designHandle.getElementFactory( ).newTableItem(
				"table1" ); 
		designHandle.getBody( ).add( table );
		OdaDataSetHandle dataSet = designHandle.getElementFactory( )
				.newOdaDataSet( "dataSet1" ); 
		designHandle.getDataSets( ).add( dataSet );
		table.setDataSet( dataSet );
		command = new ContentCommand( design, new ContainerContext( design,
				ReportDesign.DATA_SET_SLOT ) );
		command.remove( dataSet.getElement( ) );
		assertNull( table.getDataSet( ) );
	}
	/**
	 * Test method 'remove'.
	 * <p>
	 * Test Case:
	 * <ul>
	 * <li>Add content into a container. Undo and redo the operation Expected
	 * result: