ButtonTool b1 = new ButtonTool();
b1.Caption = "B1";
ButtonTool b2 = new ButtonTool();
b2.Caption = "B2";
ToolVerticalWrapPanel toolVWrapPanel = new ToolVerticalWrapPanel();
toolVWrapPanel.VerticalToolAlignment = RibbonPanelVerticalToolAlignment.Bottom;
toolVWrapPanel.Children.Add(b1);
toolVWrapPanel.Children.Add(b2);