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
}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.core.IPropertySet#setProperty(org.eclipse.birt.report.model.metadata.PropertyDefn,
	 *      java.lang.Object)
	 */
	public void setProperty( PropertyDefn prop, Object value )
	{
		setProperty( (ElementPropertyDefn) prop, value );
	}
	/**
	 * Clears the local value of the property. See <code>setProperty( )</code>
	 * for details. This is equivalent to calling
	 * <code>setProperty( propName, null )</code>.
	 * <p>
	 * Part of: Property value system.
	 * 
	 * @param propName
	 *            The name of the property to set. Must be valid. Can be a
	 *            system-defined or user-defined property name.
	 */
	public void clearProperty( String propName )
	{
		setProperty( propName, null );
	}
	/**
	 * Returns the definition object for this element.
	 * <p>
	 * Part of: Meta data system.