private void FileTreeContextMenu_Opening(object sender, System.ComponentModel.CancelEventArgs e)
{
var gitItem = (GitTree.SelectedNode != null) ? GitTree.SelectedNode.Tag as GitItem : null;
var enableItems = gitItem != null && gitItem.IsBlob;
saveAsToolStripMenuItem.Enabled = enableItems;
openFileToolStripMenuItem.Enabled = enableItems;
openFileWithToolStripMenuItem.Enabled = enableItems;
openWithToolStripMenuItem.Enabled = enableItems;
copyFilenameToClipboardToolStripMenuItem.Enabled = gitItem != null && FormBrowseUtil.IsFileOrDirectory(FormBrowseUtil.GetFullPathFromGitItem(Module, gitItem));
editCheckedOutFileToolStripMenuItem.Enabled = enableItems;
}