Bug 142432 MasterPage from library can't be restored to modify
Details: MasterPage from library can't be restored to modify Step: 1.New a library named lib1, and insert a masterpage named lib-mp. 2.Publish the library into resource folder. 3.New a report design and use lib1. 4.Drop the lib-mp from library explorer into outline of report design. 5.Double click lib-mp, and switch to Property editro tab. 6.Click restore. Actual result: Pop up an error message and said that the master page cannot specify size the page type is not custom.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/DesignElementHandle.java
if ( propDefn == null )
			return null;
		if ( propDefn.getTypeCode( ) != PropertyType.DIMENSION_TYPE )
			return null;
		return new DimensionHandle( this, propDefn );
	}
	/**
	 * Returns a handle to work with a color property. Returns null if the given
	 * property is not defined or not color property.
	 * 
	 * @param propName
	 *            name of the property.
	 * @return a corresponding ColorHandle to with with the color property.
	 *         Return <code>null</code> if the given property is not defined
	 *         or not color property.
	 * 
	 * @see ColorHandle
	 */
	public ColorHandle getColorProperty( String propName )
	{
		ElementPropertyDefn propDefn = getElement( ).getPropertyDefn( propName );
		if ( propDefn == null )
			return null;
		if ( propDefn.getTypeCode( ) != PropertyType.COLOR_TYPE )
			return null;
		return new ColorHandle( this, propDefn );
	}
	/**
	 * Gets the font handle for the element. If this element defines a font
	 * family property, return a <code>FontHandle</code>. Otherwise, return