Diagnosis
You tried to create a tab page with an element that is not a subscreenarea. However, tab pages must have the type subscreen area, since thecontents of the page are determined by a separate subscreen.

System Response
The tab page cannot be created.

Procedure
If you want to use an existing subscreen area as a tabstrip page, moveit into the page area within the tabstrip control.
if you want to create a new screen element for the tab page, choose theelement type "Subscreen area" and place the element within the pagearea of the tabstrip control.
Note: The subscreen area is only assocuated with the page belonging tothe tab title that is currently selected. You can see thisrelationship, since the name of the subscreen area is entered in the"Reference field" field in the tab title attributes.
You can make the relationship apply to more than one tab title byselecting the required tab titles using multiple selection (press andhold Ctrl or Alt, then click the required tab titles).
Note: You can also create references between tab titles and subscreenareas explicitly by entering the name of the subscreen area in thereference field field of the tab title attributes directly.