How to show minimized document window from program(MVVM)?

Hello,

I'd like to show minimized document window from program(MVVM).

Would you please teach me how to do it?

I had called "Activate()", but the minimized window had never shown.

I'd like to realize behavior like Visual Studio of MS.

1. Create program file.

2. Float program file editor and minimize it.

3. Double click the program file on project explorer

--> program file editor is shown.