void rhWidth(int nWidth)   
{
	Worksheet wks = Project.ActiveLayer();
	Tree tr;
	vector<int> vec;
	vec.Add(nWidth);        // add the row header width value into the vector
	tr.Root.Grid.Dimensions.Horizontal.Size.nVals=vec;   // asign values to the tree	
	wks.UpdateThemeIDs(tr.Root);
	wks.ApplyFormat(tr, true, true);  // Apply format stored in tree to worksheet
}