Access wraps the ActiveX control within its own object interface. You need
to unwrap this wrapper to expose the custom props and methods you created.
For Intellisense to work you have 2 options.

Note:
Instead of declaring as type Object as I have in the air code below, it
should be the actual name of the interface exposed by the ActiveX control.
For example if you had inserted the ImageXpress ActiveX control you would do
something like:
Dim obj As ImagXpress

1) In the General Declaration area of the Form's Class module declare  a
variable of type Object.
Dim obj as Object
In the Form's Load event do something like:
set obj = Me.MyActiveX.Object

Now when you want to access your ActiveX control just go through the
"obj" variable.

In the Form's Unload event don't forget to:
set obj = Nothing

or

2) When you are referencing your ActiveX control add the Object property
between your object and its properties.
Me.MyActiveX.Object.SomeProperty