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
? column.getColumnName( ) : element.getDisplayName( );
			}
		}
		return column.getColumnName( );
	}
	
	public static void setExpressionButtonImage( Button button )
	{
		String imageName;
		if ( button.isEnabled( ) )
		{
			imageName = IReportGraphicConstants.ICON_ENABLE_EXPRESSION_BUILDERS;
		}
		else
		{
			imageName = IReportGraphicConstants.ICON_DISABLE_EXPRESSION_BUILDERS;
		}
		Image image = ReportPlatformUIImages.getImage( imageName );
		GridData gd = new GridData( );
		gd.widthHint = 20;
		gd.heightHint = 20;
		button.setLayoutData( gd );
		button.setImage( image );
		if ( button.getImage( ) != null )
		{
			button.getImage( ).setBackground( button.getBackground( ) );
		}
		button.setToolTipText( Messages.getString( "ExpressionBuilder.ToolTip" ) );
	}
}