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
/**
	 * Drops a content element from the slot, and clear any reference property
	 * which refers the element to drop.
	 * 
	 * @param content
	 *            a handle to the content to drop
	 * @throws SemanticException
	 *             if the content is not within the slot
	 */
	public void dropAndClear( DesignElementHandle content )
			throws SemanticException
	{
		if ( content == null )
			return;
		ContentCommand cmd = new ContentCommand( getModule( ),
				new ContainerContext( getElement( ), propDefn.getName( ) ) );
		cmd.remove( content.getElement( ), false );
	}
	/**
	 * Drops a content element from the slot, and unresolve any reference
	 * property which refers the element to drop.
	 * 
	 * @param content
	 *            a handle to the content to drop
	 * @throws SemanticException
	 *             if the content is not within the slot
	 */
	public void drop( DesignElementHandle content ) throws SemanticException
	{
		if ( content == null )