c# - Pinch on a textbox in WPF -

i got working code scaling frameworkelements in wpf via manipulationdelta method. works kind of elements, buttons, shapes or textblock, not textboxes.

does know how can fix it?

edit: here´s simpified version of code:

 private void canvas_manipulationdelta(object sender, manipulationdeltaeventargs  e)     {         var element = e.source frameworkelement;         var transformation = element.rendertransform matrixtransform;         var matrix = transformation == null ? matrix.identity : transformation.matrix;              matrix.scaleat(e.deltamanipulation.scale.x,            e.deltamanipulation.scale.y,             1,             1);         }          matrix.rotateat(e.deltamanipulation.rotation,                         e.manipulationorigin.x,                         e.manipulationorigin.y);          matrix.translate(e.deltamanipulation.translation.x,                          e.deltamanipulation.translation.y);          element.rendertransform = new matrixtransform(matrix);          e.handled = true;         } 

the elements created genericly, it´s same xaml:

        <canvas name="somecanvas" manipulationdelta="canvas_manipulationdelta">             <textbox   canvas.left="400" canvas.top="200" height="50" name="s3" ismanipulationenabled = "true" background="#57ff3acb"  />         </canvas> 

this because textbox handles mousedown events internally. never called, manipulation can't work. here explanation:

http://msdn.microsoft.com/es-es/library/ms750580(v=vs.85).aspx

alternatively, wrap textbox in border:

<canvas name="somecanvas" manipulationdelta="canvas_manipulationdelta">     <border canvas.left="400" canvas.top="200" background="transparent" ismanipulationenabled="true">         <textbox height="50" name="s3" background="#57ff3acb" ishittestvisible="false" />     </border> </canvas> 

put ishittestvisible property false in order let mouse events pass textbox border.

furthermore, need set border's background make hit test visible.