windows 8.1 - x:Name doesn't work in XAML Flyout control -


i tried following in windows 8.1 c# app:

<!-- xaml file --> <page.bottomappbar>     <commandbar>         <appbarbutton label="add news feed" icon="add">             <appbarbutton.flyout>                 <flyout>                     <stackpanel width="400">                         <textblock textwrapping="wrap" text="enter text:" margin="0,0,0,10"/>                         <textbox x:name="inputtextbox"/>                         <button content="add" horizontalalignment="right" verticalalignment="stretch" click="addbutton_click"/>                     </stackpanel>                 </flyout>             </appbarbutton.flyout>         </appbarbutton>     </commandbar> </page.bottomappbar> 
// c# file private void addbuton_click(object sender, windows.ui.xaml.routedeventargs e) {     var text = inputtextbox.text;     // text }

however, when run app , click add button system.nullreferenceexception because member inputtextbox null. checked , generated initializecomponent method has following line:

inputtextbox = (global::windows.ui.xaml.controls.textbox)this.findname("inputtextbox");

i tried changing event handler call findname in case control created when flyout shown , still returns null. why can't findname find text box?

update: workaround

i able textbox using visualtreehelper shown below:

textbox textbox = null; var parent = visualtreehelper.getparent(sender button); var numchildren = visualtreehelper.getchildrencount(parent); (var = 0; < numchildren; ++i) {     var child = visualtreehelper.getchild(parent, i) frameworkelement;     if (child != null && child.name == "inputtextbox")     {         // found text box!         textbox = child textbox;         break;     } }  if (textbox != null) {     var text = textbox.text;     // text }

if indeed confirmed bug in windows 8.1 preview i'll go ahead , close out question.

this issue 8.1 preview , hope have issue addressed in final version of 8.1

joe


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