private void tsbDelete_Click(object sender, EventArgs e)
        {
            DialogResult dialogResult;

            if (templatesMenager.ActiveNodeType == TemplatesManager.FolderType.Folder)
            {
                dialogResult = MessageBox.Show("Delete selected category", "Confirm delete", MessageBoxButtons.OKCancel, MessageBoxIcon.Question);
            }
            else if (templatesMenager.ActiveNodeType == TemplatesManager.FolderType.File)
            {
                dialogResult = MessageBox.Show("Delete selected template", "Confirm delete", MessageBoxButtons.OKCancel, MessageBoxIcon.Question);
            }
            else
            {
                dialogResult = DialogResult.Cancel;
            }

            if (dialogResult == DialogResult.OK)
            {
                templatesMenager.Delete();
                templatesMenager.LoadAll();
            }
        }