[AccessD] Referencing parent form from subform

In the OnEnter even of the subform, I've got the following code. It says, "Run-time error '2452': The expression you entered has an invalid reference to the Parent property.
 
I've always used this little chart...for years...and its never let me down. I HAVE read it improperly before though...
 
My chart says, if I am on Sub 1, and I want to refer to a control on the main form I use
 
datDoS.Value = Me.Parent!datFormDate 
 
(I also tried adding .Value at the end...just to be sure)
 
I miss easy things quite a bit, so I'm hoping this is the case, but...
 
I'm also trying to set an enabled property, and that ain't working either..."to access a control property LIKE ENABLED..." is says, "Me.Parent!ControlName.Enabled" 
 
I am doing this inside of a CASE statement, so it is...
 
Select Case Me.Parent!txtAgeYrs
 
    Case Is < 4
        txtSurv1A.Enabled = True ...not happening
 
I'm having a very bad week...thinking about hanging up the programming and driving a truck...or diggin' ditches...

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