c# - Binding to ActualWidth in changing collection -

i have flipview control witch consists of image , text image. want text same width image. of images have different dimensions others.
here xaml code:

<flipview x:name="flipview"  horizontalcontentalignment="center" verticalcontentalignment="center" itemssource="{binding imageswithdescriptions}">     <flipview.itemtemplate>         <datatemplate>             <grid x:name="grid" tapped="flipview_tapped">                 <grid.rowdefinitions>                     <rowdefinition height="3*"/>                     <rowdefinition />                 </grid.rowdefinitions>                 <image x:name="image" grid.rowspan="2" source="{binding image}"></image>                 <grid x:name="textgrid" grid.row="1">                     <grid.background>                         <solidcolorbrush color="black" opacity="0.5"/>                     </grid.background>                     <textblock foreground="white" horizontalalignment="left" fontsize="20" text="{binding description}"/>                 </grid>             </grid>         </datatemplate>     </flipview.itemtemplate> </flipviewcontrol> 

if try bind text image's actualwidth returns 0. there way that?

edit:
looks this:

 (------------------flipview width----------------------) --------------------------------------------------------f |          |this image. it's height |            |l |          |equals flipview's height,  |            |i |          |but width depends on picture's|            |p |          |ratio, might differ on  |            |v |          |some pictures.                |            |i |          |                              |            |e |          |                              |            |w |          |                              |            | |          |                              |            |h |          |                              |            |e |----------|------------------------------|------------|i |this   |where grid named "textgrid" is|now (it's   |g |width  |the same flipview's)       |            |h --------------------------------------------------------t 

but want grid named "textgrid" have same width image has.
binding <grid x:name="textgrid" width="{binding elementname=image, path=actualwidth}"/> leads grid's width being equal 0. image loaded event returns actualwidth 0.

<flipview x:name="flipview" itemssource="{binding listtest}" horizontalcontentalignment="center" verticalcontentalignment="center" >             <flipview.itemtemplate>                 <datatemplate>                     <grid x:name="grid" background="blue" >                         <grid.rowdefinitions>                             <rowdefinition height="3*"/>                             <rowdefinition />                         </grid.rowdefinitions>                         <grid grid.rowspan="2" x:name="image">                             <image  stretch="uniform" sizechanged="image_sizechanged"  source="{binding url}" ></image>                         </grid>                         <grid   x:name="textblockgrid" grid.row="1" background="gray">                             <textblock foreground="white" textwrapping="wrap"  horizontalalignment="left" fontsize="20" text="texxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx trysffffffffffffff sdfffffffffffff dfhdffffffffffffff dfhhhhhhhhx"/>                         </grid>                     </grid>                 </datatemplate>                   </flipview.itemtemplate>          </flipview>       private void image_sizechanged(object sender, sizechangedeventargs e)     {       flipviewitem item = (flipviewitem) flipview.containerfromitem((sender image).datacontext);       var text =  findelementinvisualtree<textblock>(item);         (text.parent grid).width = (sender image).actualwidth;     }     private t findelementinvisualtree<t>(dependencyobject parentelement) t : dependencyobject     {         var count = visualtreehelper.getchildrencount(parentelement);         if (count == 0) return null;          (int = 0; < count; i++)         {             var child = visualtreehelper.getchild(parentelement, i);             if (child != null && child t)                 return (t)child;             else             {                 var result = findelementinvisualtree<t>(child);                 if (result != null)                     return result;             }         }         return null;     }