><ScrollViewer HorizontalScrollBarVisibilitty="Auto" VerticalScrollBarVisibility="Auto"> > <TabControl> > <TabItem> > <Grid> > <Grid.ColumnDefinitions> > <ColumnDefinition Width="300"/> > <ColumnDefinition/> > </Grid.ColumnDefinitions> > <StackPanel> > <!-- Main Content, allow horizontal scrolling, don´t allow vertical scrolling--> > </Stackpanel> > <StackPanel Grid.Column="1"> // Allow Vertical Scrolling > <Expander> > <!-- Description 1 --> > </Expander> > <Expander> > <!-- Description 2 --> > </Expander> > <Expander> > <!-- Description 3 --> > </Expander> > </StackPanel> > </Grid> > </TabItem> > ... > </TabControl> ></ScrollViewer> >Look back at Viv's answer, that she wrote for you.