Attaching the list
By attaching the list part to the label above it and to the push button below it, you can allow it to fill all the vertical space between those two parts:
Edge
Attachment
Top
Attachment type: XmATTACHWIDGET
Offset: 2
Attached parts: Label3
Bottom
Attachment type: XmATTACHWIDGET
Offset: 10
Attached parts: Push Button1
Left
Attachment type: XmATTACHFORM
Offset: 10
Right
Attachment type: XmATTACHPOSITION
Offset: 48
Last modified date: 01/29/2015