JTree - with two tree Models

Question

I have two types of tree Models that I would like to combine into one tree i did the combination this way:
public CombainedTreeModel(BaseTreeModel firstSubTree,BaseTreeModel secondSubTree) {
super(null);
BaseTreeNode root=new BaseTreeNode("root");
insertNodeInto(firstSubTree.getTreeRoot(),root,GuiConstants.INDEX_ZERO);
insertNodeInto(secondSubTree.getTreeRoot(),root,GuiConstants.INDEX_ONE);
and used the combined model (that is extends of BaseTreeModel -> DefaultTreeModel.) as the input of the tree.
I see that there are elements in the tree but they are not visible.....
what is the problem?

Answer 1

I had a bit different interpertation for the MVC in swing:
model - is a pure java class holds the data
control- the treeModel that pass the commands to the model and after the comand was done - remove/add/update node from the tree and commite reload so the view will be refreshed
view - the Jtree
Everything in this model used to be ok until i combined two tree model to a third model so they will be displayed together.
this is how I remove a node:
public void removeContentServer(int contentServerId) throws BitBandGuiRemoveException, BitBandGuiFindException {
if (logger.isDebugEnabled())
logger.debug("ContentTreeModel.removeContentServer");
BaseContentTreeNode contentServerNode = getContentServerNode(contentServerId);
networkModel.removeContentServer(contentServerId);
contentServerNode.removeFromParent();
if (logger.isDebugEnabled()) {
logger.debug("remove content server from the model" + contentServerId);
synchronized (contentServerNode) {
contentServerNode.removeFromParent();
if (logger.isDebugEnabled()) {
logger.debug("remove content server from the tree model");
reload(root);
}