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The drop down menu for the 'Hierarchy' view has three options: Vertical View Orientation Horizontal View Orientation Hierarchy View Only A check mark appears next to the item which is currently selected. The check mark implies that you can select more than one, or none at all. And indeed this seems to be (at least partially) the case! If you select the item which is currently selected and then display the menu again, no items will be checked. The items should be shown with a 'radio' style, and it should be impossible to deselect the current view. (Tested against 20020125 build)
we should use radio items as in Window>Open Perspective
Could the ActionContributionItem support the RADIO flag? (It asks an action for it's style)
Action and ActionContributionItem should support radio style. The Edit / Encodings menu should be changed to use this too.
Not going to happen for M4
There is now support for radio style actions for the actionSets, editorActions, and popupMenus extension points. Please update your UI where radio buttons would be more appropriate than using check boxes or some other alternative. There is a new attribute called "style" which can have the value "push", "radio", "toggle", or "pulldown". When the "style" attribute is used, then the "state" attribute can be used to specify the initial value for "toggle" and "radio" styles. The attribute "pulldown" is being deprecated.
