///<summary>
/// Sets the text on tab label of the tab containg 'w'.
///</summary>
public new void SetTabLabelText(Widget w, string text)
{
DataBookTabLabel dbt = (DataBookTabLabel)this.GetTabLabel(w);
dbt.Text = text;
}
///<summary>
/// Sets the sensitivity status of the close button of a tab containing 'w'.
///</summary>
public void SetCloseSensitivity(Widget w, bool sensitive)
{
DataBookTabLabel dbt = (DataBookTabLabel)this.GetTabLabel(w);
dbt.Button.Sensitive = sensitive;
}