Bug 179664 [Automation]CustomXML can't be set on chart[00]
Details; [Automation]CustomXML can't be set on chart[00] Step: 1.Add a chart 2.Open the properties tab and input some word in customXML Actual result: Nothing is set in customXML, when I click the enter, the customXML will come be blank.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/metadata/ElementPropertyDefn.java
* @return <code>false</code>.
	 */
	public boolean isReadOnly( )
	{
		return false;
	}
	/**
	 * Checks whether the property value can be edited by the user in the
	 * property sheet.
	 * 
	 * @return <code>true</code> if the property value is read-only,
	 *         <code>false</code> otherwise.
	 */
	public boolean isEditable( )
	{
		return !( getTypeCode( ) == IPropertyType.CHOICE_TYPE );
	}
	/**
	 * Returns the method information of this property.
	 * 
	 * @return the method information of this property. Return null, if this
	 *         property is not a method property.
	 */
	public IMethodInfo getMethodInfo( )
	{
		if ( getTypeCode( ) == IPropertyType.SCRIPT_TYPE )
			return (IMethodInfo) details;
		return null;
	}
}