It seem that GroupBox can only contain one element, if I place more than one it\'s won\'t go inside(or get deleted in blend).
Is this by design or am I doing something w
Yes, in WPF the GroupBox will contain maximum of 1 element. You can include Grid as its child and in grid specify your desired components. For example 1 placed two buttons in GroupBox using Grid.
Document Outline is shown below:
Code is as follow: