Command
QisLib_SetGeometryMarker

QisLib_SetGeometryMarker

Function:
	int QisLib_SetGeometryMarker(const char* OptionString);

Inputs:
	OptionString: "On" or "Off" or LAYERS where LAYERS="layer[,layer]"

Return:
	success: 0
	failure: one of the following values :

Errors:
	-1: The specified input is invalid (null).
	-2: The specified argument format is invalid.

Description:
	- Turns the display of markers at the first vertex of each geometry ON/OFF.
	- The kind of marker that is displayed can be set by QisLib_SetMarkerShape.
	- To display these markers on all layers, use "On".
	- To display these markers on none of the layers, use "Off".
	- Use the layer string to selectively show the markers on specific layers.


Examples:
	QisLib_SetGeometryMarker("On");
	QisLib_SetGeometryMarker("Off");
	QisLib_SetGeometryMarker("1,2");