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
* @throws MetaDataException
	 *             if the build is failed
	 */
	public void build( ) throws MetaDataException
	{
		super.build( );
		
		
		
		if ( isIntrinsic( ) && isStyleProperty( ) )
			throw new MetaDataException( new String[]{name},
					MetaDataException.DESIGN_EXCEPTION_INCONSISTENT_PROP_TYPE );
		
		if ( getTypeCode( ) == IPropertyType.ELEMENT_TYPE )
		{
			this.isInheritable = false;
		}
	}
	/**
	 * Returns the message ID for the group name.
	 * 
	 * @return The group name message ID.
	 */
	public String getGroupNameKey( )
	{
		return groupNameKey;
	}
	/**
	 * Sets whether the property value can be inherited by subclasses.
	 *