programmatically disable minimize maximize possible

Since there seems no definite way to disable and again enable the minimize, maximize and close button of the application Excel as well of the workbook, I was wondering if there is a way to programmatically disable minimizing and maximizing the workbook and application Excel.
I made a form (no userform) using my own custom toolbar and adapted screensize and I want users to exit the workbook only by using my own button and not being able to minimize or maximize the screen.