public static void UpdateProjectEntities (Project project, TableSchemaCollection tables) {
			
		}
		private TableSchemaCollection GetSelectedTables() {
			TableSchemaCollection tables = new TableSchemaCollection();
			foreach (TreeNode groupNode in tvwEntities.Nodes) {
				foreach (TreeNode node in groupNode.Nodes) {
					if (node.Checked || groupNode.Checked) {
						tables.Add((TableSchema) node.Tag);
					}
				}
			}
			return tables;
		}
		private void btnCancel_Click(object sender, System.EventArgs e) {
			_selectedTables = null;
			this.DialogResult = DialogResult.Cancel;
		}