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
Object value = getLocalProperty( module, prop );
		if ( value != null )
			return value;
		
		StyleElement style = getStyle( module );
		if ( style != null )
		{
			value = style.getLocalProperty( module, prop );
			if ( value != null )
				return value;
		}
		return null;
	}
	/**
	 * Tests if the property is inheritable in the context.
	 * 
	 * @param prop
	 *            definition of the property to test
	 * @return <code>true</code> if the property is inheritable in the
	 *         context, otherwise, <code>false</code>.
	 */
	protected boolean isInheritableProperty( ElementPropertyDefn prop )
	{
		assert prop != null;
		return prop.canInherit( );
	}
	/**
	 * Gets a property value given its definition. This version does the
	 * property search as defined by the given derived component. That is, it
	 * gets the "effective" property value. The definition can be for a system