Bug 152430 Key can modify to empty string
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/CustomColorHandle.java
* 
	 */
	public void setColor( String colorValue )
	{
		setPropertySilently( CustomColor.COLOR_MEMBER, colorValue );
	}
	/**
	 * Sets the custom color name.
	 * 
	 * @param name
	 *            the custom color name to set
	 */
	public void setName( String name )
	{
		setPropertySilently( CustomColor.NAME_MEMBER, name );
	}
	/**
	 * Returns the color value as an integer RGB value. If the color value is of
	 * a valid color representation, then return its numeric RGB value as
	 * integer. Otherwise, return <code>-1</code> indicates that the value is
	 * not valid.
	 * <p>
	 * The color value can contain any of the valid color representations:
	 * <ul>
	 * <li>INT_FORMAT: An integer with a valid RGB color value.</li>
	 * <li>HTML_FORMAT: ( #RRGGBB or #RGB )</li>
	 * <li>JAVA_FORMAT: ( 0xRRGGBB )</li>
	 * <li>CSS_ABSOLUTE_FORMAT: ( RGB(r,g,b) )</li>
	 * <li>CSS_RELATIVE_FORMAT: ( RGB(r%,g%,b%) )</li>
	 * </ul>