Bug 193895 Can not select the data cube in advanced and properties[1102]
Description: Can not select the data cube in advanced and properties[1102] Step: 1.New a report design, datasource, dataset, data cube 2.New a cross table 3.Switch Property Editor - Advanced 4.Switch Properties Actual result: Select the Cube selection and spread the drop down list, no data cube in it. Exception result: It can select the data cube in advance or properties
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/PropertyHandle.java
return;
		ContentCommand cmd = new ContentCommand( getModule( ),
				new ContainerContext( getElement( ), propDefn.getName( ) ) );
		cmd.remove( content.getElement( ), true );
	}
	/**
	 * Drops a content element at the given position from the slot, and clear
	 * any reference property which refers the element to drop.
	 * 
	 * @param posn
	 *            the position of the content to drop
	 * @throws SemanticException
	 *             if the position is out of range
	 */
	public void dropAndClear( int posn ) throws SemanticException
	{
		if ( propDefn.getTypeCode( ) == IPropertyType.ELEMENT_TYPE )
		{
			DesignElementHandle content = (DesignElementHandle) get( posn );
			dropAndClear( content );
		}
		else
		{
			removeItem( posn );
		}
	}
	/**
	 * Drops a content element at the given position from the slot, and
	 * unresolve any reference property which refers the element to drop.
	 *