Buttons should be disabled if the actions can't be performed.

[philipsens]

Is your feature request related to a problem? Please describe. The "modify", "delete" and "save" button can be clicked. This can cause some weird scenario's, like having an empty modify modal.

Describe the solution you'd like Make it possible to disable buttons. They should be grayed out.

Describe alternatives you've considered Go over the scenarios and fix them.