Class Diagram - Adding property of type another class

In Class Diagram Blank:
I am trying to add a property to Class. The type of property should be another class. However, the wizard for adding property is showing only the enumerations and it
does not show other classes.
Similar to the one shown in help contents (attached).
In Image class, captureDate is property of type Date, which is another class.
Any help much appreciated

There are certain constructions rules for data model. Among others, Classes can only be used to directly type Properties (i.e. without a corresponding Association element) if the Class is set ha Primitive. Primitive classes are similar to Datatypes. They are displayed with square corners while non Primitive classes are displayed with rounded corners.
Another construction rule is that Capella forbids to create cyles between data packages.

Thanks Stephane. That solved my issue.

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