I have this problem. VB.NET I think is seeing the inherited form as a pure class. What I did was have another form that was identical to the base form and make the designer changes then copy all the code to the base form to be inherited.
I think I had the same problem. If I changed the "Inherits..." line of code in frmInherited then I couldn't see any of the controls on frmInherited in the Windows Form Designer.
I determined that the InitializeComponent sub (in the Windows Form Designer generated code) wasn't making the necessary changes. I had to manually change the line of code that starts with:
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