Sets color to write in DXF. LTCustomizer21 for AutoCAD LT reference manual

ActiveX
    Sub set_DXF_entities_color(value As String)
C/C++
    void WINAPI LTC_set_DXF_entities_color(const wchar_t *value);

parameter
value: color code

This function sets color code to use when writes group 0 data such LINE or CIRCLE,etc.
LTCustomizer21 sets BYLAYER if you don't this function. To change color, set value using this function before you writes group 0 data.