Bug 175664 [Mac] Unexpected internal exception occurs when invoke expression builder
Description: There are two problems: 1. "fx" button (Click this button to invoke Expression Builder) could not be displayed correctly, nothing displayed in the button. 2. Click on the button, an unexpected internal exception occurs. Version:2.2.0.v20070205 Steps to reproduce: 1.Insert a Data item to the layout. Click "fx" button to invoke the expression builder, although on Mac "fx" button could not display correctly. Error log: Argument cannot be null Plug-in Provider: Eclipse.org Plug-in Name: BIRT Designer UI Plug-in ID: org.eclipse.birt.report.designer.ui Error Code: Error.GUIException.invokedByUnexpectedException Error Message:Argument cannot be null
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/util/UIUtil.java
for ( int i = 0; i < children.length; i++ )
		{
			if ( containElement( children[i], provider, element ) )
			{
				return true;
			}
		}
		return false;
	}
	/**
	 * Returns the plug-in provider
	 * 
	 * @param pluginId
	 *            the identify of the plugin
	 * 
	 * @return the plug-in provider, or null if the plug-in is not found
	 */
	public static String getPluginProvider( String pluginId )
	{
		return getBundleValue( pluginId,
				org.osgi.framework.Constants.BUNDLE_VENDOR );
	}
	/**
	 * Returns the plug-in name
	 * 
	 * @param pluginId
	 *            the identify of the plugin
	 * 
	 * @return the plug-in name, or null if the plug-in is not found
	 */