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
* defined on this element or its ancestors, and any style properties that
	 * this element supports.
	 * 
	 * @return a list of property definitions
	 */
	public List getPropertyDefns( )
	{
		List list = getDefn( ).getProperties( );
		DesignElement e = this;
		while ( e != null )
		{
			if ( e.userProperties != null )
				list.addAll( e.userProperties.values( ) );
			e = e.getExtendsElement( );
		}
		return list;
	}
	/**
	 * Returns the internal name of the element. This name matches the name of
	 * the definition for the element.
	 * 
	 * @return the internal element type name for this element
	 */
	public abstract String getElementName( );
	/*
	 * (non-Javadoc)
	 * 
	 * @see java.lang.Object#equals(java.lang.Object)
	 */
	public boolean equals( Object obj )