既定では、グリッドに重なっている透かしは印刷されませんが、
Section.PrintBackgroundプロパティにFalseを設定すると、透かしを前面に表示して印刷できます。
Imports GrapeCity.Win.MultiRow
Dim TextBoxCell1 As New TextBoxCell()
TextBoxCell1.Name = "TextBoxCell1"
Dim TextBoxCell2 As New TextBoxCell()
TextBoxCell2.Name = "TextBoxCell2"
Dim Template1 As Template = Template.CreateGridTemplate(New Cell() {TextBoxCell1, TextBoxCell2})
Template1.Row.PrintBackground = False
GcMultiRow1.Template = Template1
GcMultiRow1.RowCount = 10
using GrapeCity.Win.MultiRow;
TextBoxCell textBoxCell1 = new TextBoxCell();
textBoxCell1.Name = "textBoxCell1";
TextBoxCell textBoxCell2 = new TextBoxCell();
textBoxCell2.Name = "textBoxCell2";
Template template = Template.CreateGridTemplate(new Cell[] {textBoxCell1, textBoxCell2});
template.Row.PrintBackground = false;
gcMultiRow1.Template = template;
gcMultiRow1.RowCount = 10;