Bug 119220 Image in library can't display properly when it is imported in a report design.
Description: Image in library can't display properly when it is imported in a report design. Steps to reproduce: 1. Add an image in a library. 2. Use this library in a report design. 3. Drag the image from library explorer into layout view. 4. The image is marked invalid.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/ImageHandle.java
* @throws SemanticException
	 *             if the property is locked.
	 */
	public void setHelpText( String helpText ) throws SemanticException
	{
		setStringProperty( ImageItem.HELP_TEXT_PROP, helpText );
	}
	/**
	 * Returns the resource key of the help text of this image item.
	 * 
	 * @return the resource key of the help text
	 */
	public String getHelpTextKey( )
	{
		return getStringProperty( ImageItem.HELP_TEXT_ID_PROP );
	}
	/**
	 * Sets the resource key of help text of this image item.
	 * 
	 * @param helpTextKey
	 *            the help text
	 * 
	 * @throws SemanticException
	 *             if the property is locked.
	 */
	public void setHelpTextKey( String helpTextKey ) throws SemanticException
	{
		setStringProperty( ImageItem.HELP_TEXT_ID_PROP, helpTextKey );
	}
}