wpf - Checkbox column flickering when scrolling -

i want make simple table, whit checkbox column. created table datagrid , bound list of custom objects.

everything works fine, except notice strange flickering effect, when scroll table.
it looks this: https://imgrush.com/-ji2fpnf385o

what's problem? how can rid of this?

my xaml code:

<window x:class="mainwindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" title="mainwindow" height="350" width="723.251">  <grid>     <datagrid x:name="maindatagrid" margin="22,21,133,58"                autogeneratecolumns="false"               selectionmode="single"               selectionunit="cell"               canusersortcolumns="false"               isreadonly="true"               >     </datagrid>     <button content="populate" horizontalalignment="left" margin="592,21,0,0" verticalalignment="top" width="75" click="button_click" isdefault="true"/>     <label x:name="lbl1" content="label" horizontalalignment="left" margin="592,48,0,0" verticalalignment="top"/> </grid> </window> 

and vb code:

imports cadnet_filereader.cadnet_filereader  class mainwindow  dim outlist new list(of tags) dim selectionlock new boolean  private sub button_click(sender object, e routedeventargs)     dim tablecolumn_01 new datagridtextcolumn     tablecolumn_01.binding = new binding("tagitem")     tablecolumn_01.header = "tag name"     tablecolumn_01.width = 200     me.maindatagrid.columns.add(tablecolumn_01)      dim tablecolumn_02 new datagridcheckboxcolumn      tablecolumn_02.binding = new binding("tagcheck")     tablecolumn_02.header = "toogle"     tablecolumn_02.width = 30      me.maindatagrid.columns.add(tablecolumn_02)      dim templist new list(of string)     dim path string = "c:\epic\apps\elementcounter\epic_template.txt"     templist = readtemplatefile(path)      dim thisitem new tags      = 0 templist.count - 1         thisitem = new tags         thisitem.tagitem = templist.item(i)         thisitem.tagcheck = false         outlist.add(thisitem)     next      maindatagrid.itemssource = outlist end sub  private sub maindatagrid_selectionchanged(sender object, e selectionchangedeventargs) handles maindatagrid.selectionchanged end sub  private sub maindatagrid_selectedcellschanged(sender object, e selectedcellschangedeventargs) handles maindatagrid.selectedcellschanged     dim selectedrow integer     dim selectedcolumn integer      selectedrow = maindatagrid.items.indexof(maindatagrid.currentitem)     selectedcolumn = maindatagrid.selectedcells.item(0).column.displayindex      lbl1.content = "selected row = " & selectedrow & "; " & selectedcolumn      if selectedcolumn = 1         if outlist.item(selectedrow).tagcheck = false             outlist.item(selectedrow).tagcheck = true         else             outlist.item(selectedrow).tagcheck = false         end if       end if  end sub end class 

list item used:

<system.serializable()> public class tags     implements inotifypropertychanged     public property tagitem string     ' new property     private _newdataproperty string     public property tagcheck         set(value)             _newdataproperty = value             _propertychanged("tagcheck")         end set                     return _newdataproperty         end     end property     ' change events     private sub _propertychanged(optional byval propertyname string = nothing)         raiseevent propertychanged(me, new propertychangedeventargs(propertyname))     end sub     private event propertychanged(sender object, e propertychangedeventargs) implements inotifypropertychanged.propertychanged      public sub serializeme()     end sub end class 

well, problem is, cells rendered @ moment scroll them. first checkbox appears, selection value. described in smooth scrolling, try set

scrollviewer.cancontentscroll=false 

which draw whole list @ once (and deactivates virtualization of contents) might become real problem performance if list contains lot of entries.