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   | vla=new JTextPro(); //C'est un JTextPane
		vla.setOpaque(true);
		vla.setBackground(Color.red);
		vla.setPreferredSize(new Dimension(2000,800));
		//vla.setSize(1000, 800);
vla.insertTextEnd("Getting Started with the Simulation\n ", false, false, true, 30, Color.black);
	    vla.insertIcon(welcome);	
 
	     vla.setEditable(false);
		setLocation(150, 150);
	   // DefaultMutableTreeNode top = new DefaultMutableTreeNode("Getting Started");
	    DefaultMutableTreeNode myRoot = new DefaultMutableTreeNode("Manuel");
	    DefaultMutableTreeNode chap = new DefaultMutableTreeNode("Chapitre1");
	    myRoot.add(chap);
	    DefaultMutableTreeNode page = new DefaultMutableTreeNode("Page1");
	    chap.add(page);
	    page = new DefaultMutableTreeNode("Page2");
	    chap.add(page);
	    chap = new DefaultMutableTreeNode("Chapitre2");
	    myRoot.add(chap);
	    page = new DefaultMutableTreeNode("Page3");
	    chap.add(page);
	    
	    DefaultTreeModel myModel = new DefaultTreeModel(myRoot);
	    
//	  Construction de l'arbre.
	 final JTree tree = new JTree(myModel);
	
//tu insere ton panel une fois que tout y est inséré...
 final JScrollPane treeView = new JScrollPane(vla,JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
...
 
GridBagLayout gridbag = new GridBagLayout();
	     GridBagConstraints constraints = new GridBagConstraints();
	     getContentPane().setLayout(gridbag);
	     
	     constraints.fill=GridBagConstraints.BOTH;
	     constraints.anchor = GridBagConstraints.CENTER;
	     buildConstraints(constraints, 1,0,1,1,700,1000);
	     gridbag.setConstraints(treeView, constraints);
	     constraints.fill=GridBagConstraints.BOTH;
	     constraints.anchor = GridBagConstraints.CENTER;
	     buildConstraints(constraints, 0,0,1,1,100,10);
	     gridbag.setConstraints(tree, constraints);
	     add(tree);
	     
	    initpanel(true);
	   
	     add(treeView);
	     pack(); | 
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