On the top checkbox this error happens
Uncaught TypeError: Cannot read property '_selectAllRows' of null - see bolded line <tr> <thscope="col"class="rgHeader rgCheck"><inputid="ctl00_MainContent_AdminGrid_ctl00_ctl02_ctl01_SelectColumnSelectCheckBox"type="checkbox"name="ctl00$MainContent$AdminGrid$ctl00$ctl02$ctl01$SelectColumnSelectCheckBox"onclick="$find("ctl00_MainContent_AdminGrid")._selectAllRows("ctl00_MainContent_AdminGrid_ctl00", "", event);"/></th><thscope="col"class="rgHeader"style="display:none;"><aonclick="Telerik.Web.UI.Grid.Sort($find('ctl00_MainContent_AdminGrid_ctl00'), 'ID'); return false;"title="Click here to sort"href="javascript:__doPostBack('ctl00$MainContent$AdminGrid$ctl00$ctl02$ctl01$ctl06','')">ID</a><inputtype="submit"name="ctl00$MainContent$AdminGrid$ctl00$ctl02$ctl01$ctl07"value=" "onclick="Telerik.Web.UI.Grid.Sort($find('ctl00_MainContent_AdminGrid_ctl00'), 'ID'); return false;"title="Sorted asc"class="rgSortAsc"id="ctl00_MainContent_AdminGrid_ctl00__ID__SortAsc"style="display:none;"/><inputtype="submit"name="ctl00$MainContent$AdminGrid$ctl00$ctl02$ctl01$ctl08"value=" "onclick="Telerik.Web.UI.Grid.Sort($find('ctl00_MainContent_AdminGrid_ctl00'), 'ID'); return false;"title="Sorted desc"class="rgSortDesc"id="ctl00_MainContent_AdminGrid_ctl00__ID__SortDesc"style="display:none;"/></th><thscope="col"class="rgHeader"><aonclick="Telerik.Web.UI.Grid.Sort($find('ctl00_MainContent_AdminGrid_ctl00'), 'Field_1'); return false;"title="Click here to sort"href="javascript:__doPostBack('ctl00$MainContent$AdminGrid$ctl00$ctl02$ctl01$ctl09','')">Display Name</a><inputtype="submit"name="ctl00$MainContent$AdminGrid$ctl00$ctl02$ctl01$ctl10"value=" "onclick="Telerik.Web.UI.Grid.Sort($find('ctl00_MainContent_AdminGrid_ctl00'), 'Field_1'); return false;"title="Sorted asc"class="rgSortAsc"id="ctl00_MainContent_AdminGrid_ctl00__Field_1__SortAsc"style="display:none;"/><inputtype="submit"name="ctl00$MainContent$AdminGrid$ctl00$ctl02$ctl01$ctl11"value=" "onclick="Telerik.Web.UI.Grid.Sort($find('ctl00_MainContent_AdminGrid_ctl00'), 'Field_1'); return false;"title="Sorted desc"class="rgSortDesc"id="ctl00_MainContent_AdminGrid_ctl00__Field_1__SortDesc"style="display:none;"/></th><thscope="col"class="rgHeader"><aonclick="Telerik.Web.UI.Grid.Sort($find('ctl00_MainContent_AdminGrid_ctl00'), 'Field_2'); return false;"title="Click here to sort"href="javascript:__doPostBack('ctl00$MainContent$AdminGrid$ctl00$ctl02$ctl01$ctl12','')">Full Name</a><inputtype="submit"name="ctl00$MainContent$AdminGrid$ctl00$ctl02$ctl01$ctl13"value=" "onclick="Telerik.Web.UI.Grid.Sort($find('ctl00_MainContent_AdminGrid_ctl00'), 'Field_2'); return false;"title="Sorted asc"class="rgSortAsc"id="ctl00_MainContent_AdminGrid_ctl00__Field_2__SortAsc"style="display:none;"/><inputtype="submit"name="ctl00$MainContent$AdminGrid$ctl00$ctl02$ctl01$ctl14"value=" "onclick="Telerik.Web.UI.Grid.Sort($find('ctl00_MainContent_AdminGrid_ctl00'), 'Field_2'); return false;"title="Sorted desc"class="rgSortDesc"id="ctl00_MainContent_AdminGrid_ctl00__Field_2__SortDesc"style="display:none;"/></th><thscope="col"class="rgHeader"><aonclick="Telerik.Web.UI.Grid.Sort($find('ctl00_MainContent_AdminGrid_ctl00'), 'Email_0'); return false;"title="Click here to sort"href="javascript:__doPostBack('ctl00$MainContent$AdminGrid$ctl00$ctl02$ctl01$ctl15','')">Email</a><inputtype="submit"name="ctl00$MainContent$AdminGrid$ctl00$ctl02$ctl01$ctl16"value=" "onclick="Telerik.Web.UI.Grid.Sort($find('ctl00_MainContent_AdminGrid_ctl00'), 'Email_0'); return false;"title="Sorted asc"class="rgSortAsc"id="ctl00_MainContent_AdminGrid_ctl00__Email_0__SortAsc"style="display:none;"/><inputtype="submit"name="ctl00$MainContent$AdminGrid$ctl00$ctl02$ctl01$ctl17"value=" "onclick="Telerik.Web.UI.Grid.Sort($find('ctl00_MainContent_AdminGrid_ctl00'), 'Email_0'); return false;"title="Sorted desc"class="rgSortDesc"id="ctl00_MainContent_AdminGrid_ctl00__Email_0__SortDesc"style="display:none;"/></th><thscope="col"class="rgHeader"><aonclick="Telerik.Web.UI.Grid.Sort($find('ctl00_MainContent_AdminGrid_ctl00'), 'Field_4'); return false;"title="Click here to sort"href="javascript:__doPostBack('ctl00$MainContent$AdminGrid$ctl00$ctl02$ctl01$ctl18','')">Home Phone</a><inputtype="submit"name="ctl00$MainContent$AdminGrid$ctl00$ctl02$ctl01$ctl19"value=" "onclick="Telerik.Web.UI.Grid.Sort($find('ctl00_MainContent_AdminGrid_ctl00'), 'Field_4'); return false;"title="Sorted asc"class="rgSortAsc"id="ctl00_MainContent_AdminGrid_ctl00__Field_4__SortAsc"style="display:none;"/><inputtype="submit"name="ctl00$MainContent$AdminGrid$ctl00$ctl02$ctl01$ctl20"value=" "onclick="Telerik.Web.UI.Grid.Sort($find('ctl00_MainContent_AdminGrid_ctl00'), 'Field_4'); return false;"title="Sorted desc"class="rgSortDesc"id="ctl00_MainContent_AdminGrid_ctl00__Field_4__SortDesc"style="display:none;"/></th></tr><trclass="rgFilterRow">On the non-working Rad dropdown no error is displayed in the log, it just does not click.