private void ClearView()
{
SetViewer(null);
saveAsToolStripMenuItem.Enabled = false;
saveAsToolStripButton.Enabled = false;
propertiesToolStripMenuItem1.Enabled = false;
propertiesToolStripButton.Enabled = false;
treeView.Nodes.Clear();
nodeDictionnary.Clear();
fileNameToolStripStatusLabel.Text = "";
SetTitle(null);
}