Add error messages to all ui fuctions wich contains a required parameter

#### Is your feature request related to a problem? Please describe

some ui functions like dropdown have the parameter "required" but no possibilities to set an error message if the field is empty
#### Describe the solution you'd like

all ui functions which contains a required parameter also contains an error parameter to set a message like textboxes or comboboxes.

Start by locating UI functions that expose a required parameter, then compare their handling with textboxes and comboboxes. Done means each applicable function accepts an error message for an empty required field and the relevant tests cover the behavior.

Written by the indexing model from the issue text.