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
* @param value
	 *            The value to set for the property.
	 */
	protected void setIntrinsicProperty( String propName, Object value )
	{
		if ( propName.equals( NAME_PROP ) )
		{
			setName( (String) value );
		}
		else if ( propName.equals( EXTENDS_PROP ) )
		{
			assert getDefn( ).canExtend( );
			assert !( value instanceof ElementRefValue );
			if ( value == null || value instanceof DesignElement )
				setExtendsElement( (DesignElement) value );
			else
				setExtendsName( (String) value );
		}
		else
		{
			assert false;
		}
	}
	/**
	 * Sets the value of a property. The value must have already been validated,
	 * and must be of the correct type for the property. The property name must
	 * also be valid for this object. The name can represent a system or
	 * user-defined property. The value is set locally. If the value is null,
	 * then the property is "unset."
	 * <p>