Bug 196767 "Finish" button does not take effect when first use CSS file then import CSS style in a library [0303]
Description: "OK" button is disabled when first use CSS file then import CSS style in a library. Build number: 2.2.1.v20070717-0630 Steps to reproduce: 1. New a library, in Outline view, right click to select default Theme->Use CSS File..., select one css file, click "OK". 2. in Outline view, right click to select default Theme->Import CSS Style..., select one css file, click "Select All" button, click "OK". Expected result: "OK" button is enabled. Actual result: "Ok" button is disabled. Error log: N/A
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/ThemeHandle.java
* Returns the iterator over all included css style sheets. Each one is the
	 * instance of <code>IncludedCssStyleSheetHandle</code>
	 * 
	 * @return the iterator over all included css style sheets.
	 */
	public Iterator includeCssesIterator( )
	{
		PropertyHandle propHandle = getPropertyHandle( IThemeModel.CSSES_PROP );
		assert propHandle != null;
		return propHandle.iterator( );
	}
	/**
	 * Includes one css with the given css file name. The new css will be
	 * appended to the css list.
	 * 
	 * @param sheetHandle
	 *            css style sheet handle
	 * @throws SemanticException
	 *             if error is encountered when handling
	 *             <code>CssStyleSheet</code> structure list.
	 */
	public void addCss( CssStyleSheetHandle sheetHandle )
			throws SemanticException
	{
		CssStyleSheetHandleAdapter adapter = new CssStyleSheetHandleAdapter(
				module, getElement( ) );
		adapter.addCss( sheetHandle );
	}
	/**
	 * Includes one css with the given css file name. The new css will be