CommandContext类 参考

Public 成员函数
	CommandContext (Viewer pViewer, Document pDoc, ParameterDict parameters)
Viewer	GetViewer ()
void	SetViewer (Viewer val)
Document	GetDocument ()
void	SetDocument (Document val)
ParameterDict	GetParameters ()
void	SetParameters (ParameterDict val)
ObjectId	GetObjectId ()
SelectionManager	GetSelectionManager ()