private void btnAddChild_Click(object sender, RoutedEventArgs e)
		{
			if (this.RadViewSource.SelectedItem != null)
			{
				var item = this.RadViewSource.SelectedItem as RadTreeViewItem;
				var tag = item.Tag as StructureTreeViewModel;
				var win = new Department(0, tag.id_department);
				win.ShowDialog();
				this.RefreshTree();
			}
			else
			{
				MessageBox.Show("Трябва да изберете звено, за да добавите подзвено.");
			}
		}
		private void btnEditNode_Click(object sender, RoutedEventArgs e)
		{
			if (this.RadViewSource.SelectedItem != null)
			{
				var item = this.RadViewSource.SelectedItem as RadTreeViewItem;
				var tag = item.Tag as StructureTreeViewModel;
				var win = new Department(tag.id_department, tag.id_departmentParent);
				win.ShowDialog();
				this.RefreshTree();
			}
		}
		private void btnAddRoot_Click(object sender, RoutedEventArgs e)
		{
			var win = new Department(0);
			win.ShowDialog();
			this.RefreshTree();
		}