Specifies the angle of the first pie or doughnut chart slice, in degrees (clockwise from up, from 0 to 360 degrees). This is the property not Only of this series but of all series of parent series group - this is projection of appropriate group property. And so this property is read-Only. Use ParentSeriesGroup property for access to parent series group. Use get_ParentSeriesGroup()->get(set)_FirstSliceAngle() read/write property for change value. Read-Only uint16_t.... This is the property not only of this series but of all series...And so this property is read-only. Use ParentSeriesGroup property...