# In Documentation Wiki, refering to undocking/docking, what is the 'panel chrome'?

**URL:** <https://discourse.slicer.org/t/in-documentation-wiki-refering-to-undocking-docking-what-is-the-panel-chrome/1720>\
**Category:** Support\
**Created:** [December 26, 2017, 6:37am UTC](https://discourse.slicer.org/t/in-documentation-wiki-refering-to-undocking-docking-what-is-the-panel-chrome/1720 "2017-12-26T06:37:48Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![aNonprofessional](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/anonprofessional/32/998_2.png) [@aNonprofessional](https://discourse.slicer.org/u/aNonprofessional)\
**Post date:** [December 26, 2017, 6:37am UTC](https://discourse.slicer.org/t/in-documentation-wiki-refering-to-undocking-docking-what-is-the-panel-chrome/1720/1 "2017-12-26T06:37:48Z")

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In a Slicer Documentation Wiki I find the term ‘panel chrome’ in relation to re-docking the Welcome window after undocking it, when I am trying to see about expanding the 3D view to fill the screen.

I experimentally clicked the ‘restore’ button in the ‘Welcome To Slicer’ window, and the Welcome window undocks, and “SlicerApp-real” is added to the previously blank title bar of that window, and at that point that window has only a close window ‘X’ control. It surprises me that there isn’t a control present to re-dock the Welcome window. As I google around trying to figure out how to get it re-docked (having only the close window ‘X’ control present), I found at [https://www.slicer.org/wiki/Documentation/4.8/SlicerApplication/MainApplicationGUI#Module\_Panel](https://www.slicer.org/wiki/Documentation/4.8/SlicerApplication/MainApplicationGUI#Module_Panel) the following:

“The panel may be undocked (by left-clicking & dragging the **panel chrome** or by selecting its undock icon; hidden by selecting the hide (X) icon, or have its display toggled by selecting View-\>Module Panel. The panel can be re-docked by double-clicking on **its chrome**.”

What is the ‘ **panel chrome** ’?

I’ve never seen that phrase/term before.

I discover that double-clicking on the **title bar** of the Welcome window will re-dock the window, but why not just retain the ‘restore’ control in the title bar and make it toggle undock/redock?

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**Author:** ![lassoan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/lassoan/32/13_2.png) [@lassoan](https://discourse.slicer.org/u/lassoan)\
**Post date:** [December 26, 2017, 2:37pm UTC](https://discourse.slicer.org/t/in-documentation-wiki-refering-to-undocking-docking-what-is-the-panel-chrome/1720/2 "2017-12-26T14:37:41Z")

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[Window chrome](https://www.nngroup.com/articles/browser-and-gui-chrome/) refers to nonclient area of a window. I’ve updated the wiki page to use simpler terms - window title bar and frame.

Qt’s default behavior is to show only a close button on undocked widgets. I agree that it could be useful to add a “dock” button in its title bar. This is already tracked here: [https://issues.slicer.org/view.php?id=1323](https://issues.slicer.org/view.php?id=1323)