Bug 122850 Table/list should not be able to be inserted in Master Page mode.
Description: Table/list should not be able to be inserted in Master Page mode. Steps to reproduce: 1. New a report and transfer to Master Page mode. 2. New a datasource and dataset 3. Drag a list/table to page header/footer, bind it to dataset and drag some columns inside. 4. Save and preview Expected result: Insert list/table item in master page should be forbidden. Actual result: They are allowed and preview showed "undefine" in page
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/core/DesignElement.java
*         otherwise <code>false</code>.
	 */
	public final boolean canContain( Module module, int slotId,
			IElementDefn defn )
	{
		assert defn != null;
		boolean retValue = canContainInRom( slotId, defn );
		if ( !retValue )
			return false;
		
		
		if ( isRootIncludedByModule( ) )
			return false;
		if ( !canContainTemplateElement( module, slotId, defn ) )
			return false;
		
		
		if ( isVirtualElement( ) || getExtendsElement( ) != null )
			return false;
		
		DesignElement tmpContainer = this;
		while ( tmpContainer != null )
		{
			if ( tmpContainer instanceof ListingElement )
			{
				List errors = tmpContainer.checkContent( module, this, slotId,
						defn );
				return errors.isEmpty( );
			}
			tmpContainer = tmpContainer.getContainer( );