[Lazarus] Modal forms: block parent form or application

[cobines]

Hello,

I have two forms Form1 and Form2. Form1 is MainForm with
ShowInTaskbar=stDefault and Form2 has ShowInTaskbar=True, so they both
have taskbar buttons, I treat them as separate windows. I show a modal
form from Form2 which blocks the whole application. Is it possible to
have it block only Form2, so I can still activate and work in Form1?

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cobines