Bug 200143 If do not allow user to modify the expression, the button fx should be disabled[0005]
Description: If do not allow user to modify the expression, the button fx should be disabled[0005] Build number: 2.2.1.v20070816-0630 Steps to reproduce: 1, New a table1 with one binding 2, New a table share table1's result set 3, Drag a data item into the table 4, after specify the column binding name try to modify the expression Expected result: The expression button should be disable. Actual result: The expression can be edit but can not save, so the button should be disable Error log:
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/dialogs/BindingDialogHelper.java
initDataFields( );
			initFilter( );
			initGroups( );
		}
	}
	private void initFilter( )
	{
		if ( binding != null && binding.getFilterExpression( ) != null )
		{
			txtFilter.setText( binding.getFilterExpression( ) );
		}
	}
	private void initFunction( )
	{
		cmbFunction.setItems( getFunctionDisplayNames( ) );
		
		if ( binding == null )
		{
			cmbFunction.select( 0 );
			handleFunctionSelectEvent( );
			return;
		}
		String functionString = getFunctionDisplayName( binding.getAggregateFunction( ) );
		int itemIndex = getItemIndex( getFunctionDisplayNames( ),
				functionString );
		cmbFunction.select( itemIndex );
		handleFunctionSelectEvent( );
		
		
		for ( Iterator iterator = binding.argumentsIterator( ); iterator.hasNext( ); )