Program: 118597
Project: 118597
Buggy source:
public Command createComboCommand(SelectionEvent event,GenericElementParameter gParam,ComponentReferenceProperties props){
  Set<String> elementsName;
  Control ctrl;
  elementsName=hashCurControls.keySet();
  for (  String name : elementsName) {
    Object o=hashCurControls.get(name);
    if (o instanceof Control) {
      ctrl=(Control)o;
      CCombo combo=(CCombo)event.getSource();
      Object data=ctrl.getData(PARAMETER_NAME);
      if (!(ctrl instanceof CCombo)) {
        continue;
      }
      boolean isDisposed=((CCombo)ctrl).isDisposed() || combo.isDisposed();
      if (isDisposed) {
        continue;
      }
      if (data != null && data.equals(combo.getData(PARAMETER_NAME))) {
        if (!((CCombo)ctrl).getText().equals(elem.getPropertyValue(name))) {
          String value="String_Node_Str";
          List<? extends IElementParameter> params=elem.getElementParametersWithChildrens();
          boolean done=false;
          for (int i=0; i < params.size() && !done; i++) {
            IElementParameter param=params.get(i);
            if (param.getName().equals(name)) {
              for (int j=0; j < param.getListItemsValue().length; j++) {
                if (((CCombo)ctrl).getText().equals(param.getListItemsDisplayName()[j])) {
                  value=(String)param.getListItemsValue()[j];
                  if (j == 0) {
                    props.referenceType.setValue(ComponentReferenceProperties.ReferenceType.THIS_COMPONENT);
                    props.componentInstanceId.setValue(null);
                    props.componentProperties=null;
                  }
 else {
                    props.referenceType.setValue(ComponentReferenceProperties.ReferenceType.COMPONENT_INSTANCE);
                    props.componentInstanceId.setValue(TalendTextUtils.addQuotes(value));
                    GenericElementParameter gParameter=(GenericElementParameter)param;
                    if (gParameter != null && gParameter.getElement() != null && gParameter.getElement() instanceof Node) {
                      Node node=(Node)gParameter.getElement();
                      List<INode> refNodes=(List<INode>)node.getProcess().getNodesOfType(props.componentType.getStringValue());
                      for (                      INode refNode : refNodes) {
                        if (refNode.getUniqueName() != null && refNode.getUniqueName().equals(value)) {
                          props.componentProperties=refNode.getComponentProperties();
                        }
                      }
                    }
                  }
                  done=true;
                  break;
                }
              }
            }
          }
          if (StringUtils.isBlank(value)) {
            value=((INode)elem).getUniqueName();
          }
          if (value.equals(elem.getPropertyValue(name))) {
            return null;
          }
          return new PropertyChangeCommand(elem,name,value);
        }
      }
    }
  }
  return null;
}

Fixed version (ground truth):
public Command createComboCommand(SelectionEvent event,GenericElementParameter gParam,ComponentReferenceProperties props){
  Set<String> elementsName;
  Control ctrl;
  elementsName=hashCurControls.keySet();
  for (  String name : elementsName) {
    Object o=hashCurControls.get(name);
    if (o instanceof Control) {
      ctrl=(Control)o;
      CCombo combo=(CCombo)event.getSource();
      Object data=ctrl.getData(PARAMETER_NAME);
      if (!(ctrl instanceof CCombo)) {
        continue;
      }
      boolean isDisposed=((CCombo)ctrl).isDisposed() || combo.isDisposed();
      if (isDisposed) {
        continue;
      }
      if (data != null && data.equals(combo.getData(PARAMETER_NAME))) {
        String newValue=((CCombo)ctrl).getText();
        String v=labelToValueMap.get(newValue);
        if (v != null) {
          newValue=v;
        }
        if (!newValue.equals(elem.getPropertyValue(name))) {
          String value="String_Node_Str";
          List<? extends IElementParameter> params=elem.getElementParametersWithChildrens();
          boolean done=false;
          for (int i=0; i < params.size() && !done; i++) {
            IElementParameter param=params.get(i);
            if (param.getName().equals(name)) {
              for (int j=0; j < param.getListItemsValue().length; j++) {
                if (((CCombo)ctrl).getText().equals(param.getListItemsDisplayName()[j])) {
                  value=(String)param.getListItemsValue()[j];
                  if (j == 0) {
                    props.referenceType.setValue(ComponentReferenceProperties.ReferenceType.THIS_COMPONENT);
                    props.componentInstanceId.setValue(null);
                    props.componentProperties=null;
                  }
 else {
                    props.referenceType.setValue(ComponentReferenceProperties.ReferenceType.COMPONENT_INSTANCE);
                    props.componentInstanceId.setValue(value);
                    GenericElementParameter gParameter=(GenericElementParameter)param;
                    if (gParameter != null && gParameter.getElement() != null && gParameter.getElement() instanceof Node) {
                      Node node=(Node)gParameter.getElement();
                      List<INode> refNodes=(List<INode>)node.getProcess().getNodesOfType(props.componentType.getStringValue());
                      for (                      INode refNode : refNodes) {
                        if (refNode.getUniqueName() != null && refNode.getUniqueName().equals(value)) {
                          props.componentProperties=refNode.getComponentProperties();
                        }
                      }
                    }
                  }
                  done=true;
                  break;
                }
              }
            }
          }
          if (StringUtils.isBlank(value)) {
            value=((INode)elem).getUniqueName();
          }
          if (value.equals(elem.getPropertyValue(name))) {
            return null;
          }
          return new PropertyChangeCommand(elem,name,value);
        }
      }
    }
  }
  return null;
}