Gets the colors of the track, as an array of two colors.
You can use the same color twice for a solid track color.
You use this property along with the fillAlphas property. Typically you set fillAlphas to [ 1.0, 1.0 ] when setting trackColors.
The default value is [ 0xE7E7E7, 0xE7E7E7 ].
'Declaration Protected Read Property trackColors As List(Of Color)