/**
* If there isn't currently a {@link ThemesTable} for the
* current Workbook, then creates one and sets it up.
* After this, calls to {@link #getTheme()} won't give null
*/
public void EnsureThemesTable()
{
if (theme != null)
{
return;
}
theme = (ThemesTable)workbook.CreateRelationship(XSSFRelation.THEME, XSSFFactory.GetInstance());
}
