How can I make a fsStayOnTop form the active form?

[Tom F 83]

In VCL, how to make a fsStayOnTop form the active form?

I have a main form and a non-modal subform.

When the Main form is active, if the user enters a specific key associated with a shortcut on the non-modal form, my main form calls a method in the non-modal form.  

But, how can I make the non-modal form the active form when it receives this call?

I've tried to assign Screen.ActiveForm and SuForm.Active, but both are read-only.

[Anders Melander 1784]

TForm.SetFocus maybe. Otherwise I would think TForm.Show would activate the form - regardless of it being already visible.

[Tom F 83]

TForm.SetFocus worked from the subform.

Thank you, Anders!