All, I think I hit a bug in QCMagritte. If you have groups (or objects embedded via MAToOneRelation) theses are rendered as collapsed groups by default. However it is not possible to uncollapse them. This is IMHO due to a bug in MAContainer>>#isCollapsed:. As far as I read the code in #isCollapsed:/#setCollapsed:for: and #defaultCollapsed groups, it's not possible to un-collapse groups because neither #setCollapsed:for: nor #isCollapsed: *sets* the property. Both use #at:ifAbsent:. Changing #isCollapsed: to use #at:ifAbsentPut: seems to solve the issue: isGroupCollapsed: aGroup ^ (self propertyAt: #collapsedGroups ifAbsentPut: [ self defaultCollapsedGroups ]) includes: aGroup CU, Udo +