tickmarks and ticklines parameters
   group AGTickParams
{
     AGColor     majorTickColor;
     AGLineStyle majorTickLineStyle;
     AGBoolean   majorTickOn;
     AGDistance  majorTickWidth;
     AGColor     minorTickColor;
     AGInt       minorTickCount;
     AGLineStyle minorTickLineStyle;
     AGDistance  minorTickWidth;
};
AGTickParams is a base object containing parameters common to all axis and ticklines objects.It defines generic tickmarks and ticklines. The AGXTickLines and AGYTicklines objects inherit parameters from AGTickParams and use them to define ticklines. AGXAxis, AGYAxis, AGXUserAxis, and AGYUserAxis inherit parameters from AGTickParams and use them to define tickmarks.