Access Combobox selectedText in WPF Datagrid column header? -

i have wpf datagrid pretty standard, except headers not text, combobox control.

here screenshot demonstrate:

goes without saying there multiple columns. columns created programatically.

what traverse column headers, , selectedtext each combobox.

how done?

edit:

the code expect writing along these lines:

foreach (datagridcolumnheader columnheader in columnheaders) {     var combobox = (combobox) columnheader.controls[0];     var thedroidiamlookingfor = combobox.text;   } 

i don´t know how combobox in columnheader assume via columnheaderstyle, approach binding selectedvalueproperty property in codebehind or viewmodel

<combobox x:name="headercombobox" itemssource="{binding path=headersource}"> <combobox.selectedvalue>     <binding path="headerselectedvalue" mode="twoway" /> </combobox.selectedvalue> 

edit: c# solution (not tested)

foreach (var column in mygrid.columns) {     var colheader = (dependencyobject)column.header;     var headercombobox = colheader.getchildoftype<combobox>();     var selected = headercombobox.selectedvalue.tostring(); } 

and here extensionmethod getchildoftype

public static t getchildoftype<t>(this dependencyobject depobj) t : dependencyobject {     if (depobj == null) return null;     (int = 0; < visualtreehelper.getchildrencount(depobj); i++)     {         var child = visualtreehelper.getchild(depobj, i);          var result = (child t) ?? getchildoftype<t>(child);         if (result != null) return result;     }     return null; } 

edit 2: if define columnheader this

<datagridtextcolumn width="250">     <datagridtextcolumn.header>         <combobox width="200">             <combobox.items>                 <comboboxitem content="test1"/>                 <comboboxitem content="test2"/>             </combobox.items>         </combobox>     </datagridtextcolumn.header> </datagridtextcolumn> 

then column.header combobox no need going down visualtree cast combobox

var colheader = (combobox)column.header; 

maybe show me how define comboboxes in columnheader