xaml - Custom WPF ComboBox doesn't show grouping -


i have created custom combobox in wpf

<!-- combobox template -->     <controltemplate x:key="customcomboboxtogglebutton" targettype="togglebutton">         <grid>             <grid.columndefinitions>                 <columndefinition/>                 <columndefinition width="20"/>             </grid.columndefinitions>             <border x:name="border" grid.columnspan="2" cornerradius="3" background="{staticresource customdarkblue}" borderbrush="{staticresource customwhite}" borderthickness="2"/>             <border x:name="border2" grid.column="0" cornerradius="3,0,0,3" margin="1" background="{staticresource custombackground}" borderbrush="{staticresource customwhite}" borderthickness="1,1,2,1"/>             <path x:name="arrow" grid.column="1" fill="{staticresource customglyph}" horizontalalignment="center" verticalalignment="center" data="m 0 0 l 4 4 l 8 0 z"/>         </grid>         <controltemplate.triggers>             <trigger property="togglebutton.ismouseover" value="true">                 <setter targetname="border" property="background" value="{staticresource customdarkblue}"/>             </trigger>             <trigger property="togglebutton.ischecked" value="true">                 <setter targetname="border" property="background" value="{staticresource customdarkblue}"/>             </trigger>             <trigger property="isenabled" value="false">                                     <setter targetname="border" property="borderbrush" value="{staticresource customgray}"/>                 <setter targetname="border2" property="borderbrush" value="{staticresource customgray}"/>                 <setter property="foreground" value="{staticresource customgray}"/>                 <setter targetname="arrow" property="fill" value="{staticresource customgray}"/>             </trigger>         </controltemplate.triggers>     </controltemplate>      <!-- combobox -->     <style x:key="roundedcombobox" targettype="{x:type combobox}">         <setter property="snapstodevicepixels" value="true"/>         <setter property="overridesdefaultstyle" value="true"/>         <setter property="scrollviewer.horizontalscrollbarvisibility" value="auto"/>         <setter property="scrollviewer.verticalscrollbarvisibility" value="auto"/>         <setter property="scrollviewer.cancontentscroll" value="true"/>                     <setter property="foreground" value="{staticresource customwhite}"/>         <setter property="background" value="{staticresource custombackground}"/>         <setter property="height" value="21"/>         <setter property="fontsize" value="14"/>         <setter property="focusvisualstyle" value="{x:null}"/>         <setter property="template">             <setter.value>                 <controltemplate targettype="combobox">                     <grid>                         <togglebutton name="togglebutton" template="{staticresource customcomboboxtogglebutton}" grid.column="2" focusable="false" ischecked="{binding path=isdropdownopen,mode=twoway,relativesource={relativesource templatedparent}}" clickmode="press"/>                         <contentpresenter name="contentsite" ishittestvisible="false" content="{templatebinding selectionboxitem}" contenttemplate="{templatebinding selectionboxitemtemplate}" contenttemplateselector="{templatebinding itemtemplateselector}" contentstringformat="{templatebinding selectionboxitemstringformat}" margin="3,1,23,1" verticalalignment="center" horizontalalignment="left"/>                                                     <popup name="popup" placement="bottom" isopen="{templatebinding isdropdownopen}" allowstransparency="true" focusable="false" popupanimation="slide">                             <grid name="dropdown" snapstodevicepixels="true" minwidth="{templatebinding actualwidth}" maxheight="{templatebinding maxdropdownheight}">                                 <border x:name="dropdownborder" background="{staticresource custombackground}" borderthickness="2" borderbrush="{staticresource customwhite}"/>                                 <scrollviewer margin="4,6,4,6" snapstodevicepixels="true">                                     <stackpanel isitemshost="true" keyboardnavigation.directionalnavigation="contained"/>                                 </scrollviewer>                             </grid>                         </popup>                     </grid>                     <controltemplate.triggers>                         <trigger property="hasitems" value="false">                             <setter targetname="dropdownborder" property="minheight" value="95"/>                         </trigger>                         <trigger property="isenabled" value="false">                             <setter property="foreground" value="{staticresource customgray}"/>                                                         </trigger>                         <trigger property="isgrouping" value="true">                             <setter property="scrollviewer.cancontentscroll" value="false"/>                         </trigger>                         <trigger sourcename="popup" property="popup.allowstransparency" value="true">                             <setter targetname="dropdownborder" property="cornerradius" value="4"/>                             <setter targetname="dropdownborder" property="margin" value="0,2,0,0"/>                         </trigger>                                                 </controltemplate.triggers>                 </controltemplate>             </setter.value>         </setter>     </style>

this applied combobox

<combobox grid.column="0" x:name="cbochild" margin="140,65,0,0"  itemssource="{binding source={staticresource groupeddata}}" itemtemplate="{staticresource accounttemplate}" selectedvalue="{binding source={staticresource item}, path=child}" selectedvaluepath="id" width="150" style="{staticresource roundedcombobox}" horizontalalignment="left" verticalalignment="top">                                                 <combobox.groupstyle>                             <groupstyle headertemplate="{staticresource groupheader}"/>                                                         </combobox.groupstyle>                     </combobox>

the following found in window.resources

<window.resources>     <collectionviewsource source="{binding childaccounts}" x:key="groupeddata">         <collectionviewsource.groupdescriptions>             <propertygroupdescription propertyname="group"/>         </collectionviewsource.groupdescriptions>     </collectionviewsource>      <datatemplate x:key="groupheader">         <textblock text="{binding group}" margin="0" foreground="{staticresource customwhite}"/>     </datatemplate>     <datatemplate x:key="accounttemplate">         <textblock text="{binding comment}" margin="0" foreground="{staticresource customwhite}"/>     </datatemplate>         </window.resources>

basically grouping works should when roundedcombobox style not applied (ie. default combobox) whenever style applied drop-down popup empty

help!!

thanks andy

found answer..... use <itemspresenter ...> instead of <stackpanel ...>

thanks sa_ddam213 helpful advice above regarding binding.

andy


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