Input Box in custom module like that for stages in deals

Input Box in custom module like that for stages in deals

I am trying to setup a custom module with a dropdown list that when clicked on a certain option and saved a input box pops up with a input field where i can give a reason why this option was chosen like that in the deals module when a new stage is chosen 

I have tried openurl with a form and a popup window but i don't want a separate window to open i want it open in the same Tab by just darkening the screen behind it 

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