Use the Parent property in the UserControl_Show event

[vbhelper]

Let me confirm about the Parent property of an ActiveX control, UserControl created with VB6.0. Assume that the container would be IE5.0 SP2 or higher.

Now I have a question regarding with the usage of the Parent property in the UserControl_Show event.
I am aware that the UserControl_Show event allows me to get Parent as a MSHTML.HTMLDocument type object. Using this, I wrote code so that it can retrieve the value of the HIDDEN field in HTML like below:

Parent.parentWindow.document.Forms.Item("FORM‚ÌID").Item("HIDDEN‚ÌID").Value

I have already confirmed that this is possible and work well.

What I would like to ask is:

When the Parent property is used in the UserControl_Show event, can I assume that HTMLDocument of the container IE has been completely loaded?
I mean, can I assume the case, which the UserControl_Show event fires while HTMLDocument is being loaded and this causes the unloaded HIDDEN field to be refered, leading to an error, never occurs?

[vbhelper]

Is there anyone who can help me out?