Watermarks are images displayed by the control at the top or bottom of the z order.
The Sales for country controls the watermark used to display for a country selected from the list.
The Show flag above chart allows you to place the watermark at the top or bottom of the image.
The content alignment combo box allows you to select how the legend content will align relative to the location defined by the X Margin nad Y Margin combos.
Use the Transparency combo to control the transparency of the watermark.