If you use your own menu or toolbars and forward the execution of a menu via ExecuteMenu(String) to CADability you must know in advance the state of the menu items (like enabled or checked). When dropping down a menu is a good trigger to request for the states of the menu items. Toolbar items are usually updated on the OnIdle event of the application.

public bool UpdateMenu(
	string MenuId,
	out CommandState commandState
)

Public Function UpdateMenu ( _
	MenuId As String, _
	<OutAttribute> ByRef commandState As CommandState _
) As Boolean

public:
bool UpdateMenu(
	String^ MenuId, 
	[OutAttribute] CommandState^% commandState
)