For adding nestable selection commands that work like the native Rhino SelCrv command, derive your command from SelCommand and override the virtual SelFilter function.

System.Object
  Rhino.Commands.Command
    Rhino.Commands.SelCommand
Namespace: Rhino.Commands
Assembly: RhinoCommon (in RhinoCommon.dll) Version: Rhino 6.0

C#

public abstract class SelCommand : Command

VB

Public MustInherit Class SelCommand
	Inherits Command

The SelCommand type exposes the following members.

	Name	Description
	SelCommand	Initializes a new instance of the SelCommand class

	Name	Description
	BeQuiet
	CommandContextHelpUrl	Gets the URL of the command contextual help. This is usually a location of a local CHM file. The default implementation return an empty string. (Inherited from Command.)
	EnglishName	Gets the name of the command. This method is abstract. (Inherited from Command.)
	Id	Gets the unique ID of this command. It is best to use a Guid attribute for each custom derived command class since this will keep the id consistent between sessions of Rhino GuidAttribute (Inherited from Command.)
	LocalName	Gets the local name of the command. (Inherited from Command.)
	PlugIn	Gets the plug-in where this commands is placed. (Inherited from Command.)
	Settings	Gets the settings of the command. (Inherited from Command.)
	TestGrips
	TestLights

	Name	Description
	Equals	Determines whether the specified object is equal to the current object. (Inherited from Object.)
	Finalize	Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
	GetHashCode	Serves as the default hash function. (Inherited from Object.)
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	OnHelp	Is called when the user needs assistance with this command. (Inherited from Command.)
	ReplayHistory	Repeats an operation of a command. In order to make this function work, you will likely need to grab the Result property that gives the list of input objects. Then, you will be able to replace these inputs by using one of the UpdateToX() methods of the ReplayHistoryResult. You should NOT use any document AddX() or ReplaceX() functions, as they will break history. (Inherited from Command.)
	RunCommand	(Overrides Command.RunCommand(RhinoDoc, RunMode).)
	SelFilter	Override this virtual function and return true if object should be selected.
	ToString	Returns a string that represents the current object. (Inherited from Object.)

Supported in: 5D58w

Rhino.Commands Namespace