Switch between window modal/not modal

[kicaj]

Is there a way to switch window when the window is visible between modal and not modal ?

Example: when window is read mode window is not modal, when user click in button 'Edit mode' (button is on this window) the window should be switch to modal, and when user click 'Save' the window should be switch to not modal.

[RobDog888]

You can not change the modality of a window once its displayed. The window structure is different between the two.