RMC_CODelete function.
Delete a CustomObject.
Syntax
	nResult (LONG) = RMC_CODelete( ByVal nCtrlId (LONG), ByVal nCOIndex (LONG) )
Parameter
	nCtrlId (LONG)
		Unique ID of the chart control.
	nCOIndex (LONG)
		Index of the CustomObject, which shall be deleted.
Remarks
		Normally there is no need to delete an existing CustomObject: if you close the window/dialog, in which the chart resides, which owns the custom objects, they get deleted together with the chart. If you delete the chart explicitly with RMC_DeleteChart, exisiting custom objects of this chart get also deleted. And if you want to replace an existing CustomObject with another one, simply call the appropriate RMC_CO...() function with the same index, which you used to create the old CustomObject.
Return value
	0
		No error, function succeeded.
	RMC_ERROR_CTRLID
		Wrong control ID (0 or no chart with this control ID was found).
	RMC_ERROR_CUSTOMINDEX
		Parameter nCOIndex is not valid (either 0 or it exceeds the maximum number of CustomObjects (200).