WPF ListBox: Vertical scrollbar and focus -

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i have 2 problems regarding listbox/wrappanel.

first of all, setup: in xaml have listbox. inside of listbox wrappanel. programatically add listboxitems wrappanel.

problem one

the listboxitems [stackpanel image , textblock] fills left right , down. however, vertical scrollbar not appear if there more listboxitems there space in listbox. following xaml code makes vertical scrollbar visible. however, remains disabled:

<listbox name="li1standortlinks" background="transparent" maxheight="300" scrollviewer.verticalscrollbarvisibility="visible">     <wrappanel name="wp1standortlinks" itemheight="80" itemwidth="150" width="755" /> </listbox>

how functional vertical scrollbar when needed?

problem two

when clicking listbox not @ listboxitem [for example, in between 2 of them], background of whole listbox gets highlighted in blue. background transparent , should remain if listbox clicked. catching click-event , setting background transparent seems not help. blue highlight-color disappear, instead of listbox background going transparent, remains grey. can change style color not change @ when clicking @ listbox? never changed styles in wpf, though, i'd need precise explaination.

this may work problem 1 : 

    <listbox name="li1standortlinks" background="transparent" maxheight="300" scrollviewer.verticalscrollbarvisibility="visible">    <listbox.itemspanel>         <itemspaneltemplate>             <wrappanel isitemshost="true" orientation="horizontal"  />         </itemspaneltemplate>     </listbox.itemspanel> </listbox>

for problem 2 : may work (change style listbox)

<listbox name="li1standortlinks" background="transparent" maxheight="300" scrollviewer.verticalscrollbarvisibility="visible">  <listbox.style>  <style  targettype="listbox">             <style.resources>                 <!-- background of selected item when focussed -->                 <solidcolorbrush x:key="{x:static systemcolors.highlightbrushkey}" color="transparent" />                 <!-- background of selected item when not focussed -->                 <solidcolorbrush x:key="{x:static systemcolors.controlbrushkey}" color="transparent" />                  <solidcolorbrush x:key="{x:static systemcolors.highlighttextbrushkey}" color="black" />             </style.resources>         </style> </listbox.style> </listbox>

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