> Where can I set the EditMask in the IB_EditEnh-Control ?

Same place you do for standard mask - in the connection or dataset
FieldsEditMask property. The difference being that enhanced masks
come with prefix like '::NM::';

> I need an EditMask for time-values, like hh:mm. But when the user enters
> only 15, the mask sould convert it into 15:00.

Drop a standard TEditEnh control onto a form, click the property
editor button in the EditMask property. This will show a dialog in
which you can experiment with masks - and try out the various samples
(including some date/time stuff). When you get the mask that you want
there is an edit control at the bottom of the dialog from which you
can copy the string that you need to assign in the IBO FieldsEditMask
property.

For more info search for TMaskEnhString in the Enh online help.

hth

--
Geoff Worboys
Telesis Computing