.net - How set a GroupBox height to size a window, if content is larger heigh, then need show ScrollViewer -

.net - How set a GroupBox height to size a window, if content is larger heigh, then need show ScrollViewer -

i want have groupbox height size window , if content larger height, show scrollviewer. set size size content or maxheight (if set).

<stackpanel> <groupbox> <scrollviewer verticalalignment="top" horizontalscrollbarvisibility="auto" verticalscrollbarvisibility="visible"> <stackpanel> <button verticalalignment="top">button</button> <button verticalalignment="top">button</button> <button verticalalignment="top">button</button> <button verticalalignment="top">button</button> <button verticalalignment="top">button</button> <button verticalalignment="top">button</button> <button verticalalignment="top">button</button> <button verticalalignment="top">button</button> <button verticalalignment="top">button</button> <button verticalalignment="top">button</button> <button verticalalignment="top">button</button> <button verticalalignment="top">button</button> <button verticalalignment="top">button</button> <button verticalalignment="top">button</button> <button verticalalignment="top">button</button> <button verticalalignment="top">button</button> <button verticalalignment="top">button</button> <button verticalalignment="top">button</button> <button verticalalignment="top">button</button> <button verticalalignment="top">button</button> </stackpanel> </scrollviewer> </groupbox> </stackpanel>

i found if replace outer stackpanel dockpanel work.

<dockpanel> <groupbox dockpanel.dock="top"> <scrollviewer verticalalignment="top" horizontalscrollbarvisibility="auto" verticalscrollbarvisibility="visible"> <stackpanel> <button verticalalignment="top">button</button>

.net wpf xaml