The 'fillmarker' property

Boolean Scalar

Valid for: Series

Where markers are drawn for the points of a Series displayed on a Chart object, by default they are drawn in outline only. If you set the fillmarker property of the Series object to 1, the markers will be filled with the current marker background color (as set by the colormarker property), provided it is one of the following shapes: ○ ⌽ ⊖ ∇ ∆ ⋄ ⎕

See also the marker and colormarker properties.