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
* @return Returns the displayNameID.
	 */
	public String getDisplayNameID( )
	{
		return (String) getLocalProperty( null, DISPLAY_NAME_ID_PROP );
	}
	/**
	 * Sets the unique ID for this element. The ID can be set only once, when
	 * the element is first added to the design.
	 * 
	 * @param newID
	 *            The id to set.
	 */
	public void setID( long newID )
	{
		id = newID;
	}
	/**
	 * Returns the unique element ID. The ID will be valid only if element IDs
	 * were enabled in the MetaDataDictionary.
	 * 
	 * @return The unique ID. Returns 0 if element IDs are not enabled.
	 */
	public long getID( )
	{
		return this.id;
	}
	/**
	 * Determines if this element is contained in the given element. Checks up
	 * the containment hierarchy.