public void setNodeMappingToDisplay(String targetDE, String expression) {
exprSource = new TransformationExpressionSource(treeMapper.getTransformation(), new NodePath(targetDE));
expressionParser = createExpressionParser();
scriptModel.setSource(exprSource);
TargetNode targetNode = getTargetNode(targetDE);
scriptBuilder.getDebugUi().getModel().setTargetNode(targetNode);
expressionScanner.uninstall(getExpressionArea().getTextPane());
scriptBuilder.setExpression(checkEmptyExpression(expression));
expressionScanner = createExpressionScanner();
}