c# - Why tooltip doesn't update it's content when binding changes? -

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i have written following xaml code:

<window x:class="wpfapplication3.mainwindow"         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"         title="mainwindow" height="200" width="200">     <stackpanel>         <listbox name="listbox">             <listboxitem content="item1" />             <listboxitem content="item2" />             <listboxitem content="item3" />         </listbox>          <textblock datacontext="{binding elementname=listbox, path=selecteditem}" text="{binding content}" tooltip="{binding content}" />          <textblock datacontext="{binding elementname=listbox, path=selecteditem}" text="{binding content}">             <textblock.tooltip>                      <tooltip content="{binding content}"/>                           </textblock.tooltip>         </textblock>     </stackpanel> </window>

why first tooltip has same text it's parent textblock , second never changes it's content when change selected item in listbox?

in second example you're setting tooltip of textblock tooltip. set content of tooltip tooltip. these same first.

<textblock datacontext="{binding elementname=listbox, path=selecteditem}" text="{binding content}" tooltip="{binding content}" /> <textblock datacontext="{binding elementname=listbox, path=selecteditem}" text="{binding content}">      <textblock.tooltip>               <binding path="content"/>                    </textblock.tooltip> </textblock>

and these pretty same last

<window.resources>     <tooltip x:key="mytooltip" content="{binding content}"/> </window.resources>  <textblock datacontext="{binding elementname=listbox, path=selecteditem}" text="{binding content}" tooltip="{binding source={staticresource mytooltip}}" /> <textblock datacontext="{binding elementname=listbox, path=selecteditem}" text="{binding content}">      <textblock.tooltip>               <tooltip content="{binding content}"/>                    </textblock.tooltip> </textblock>

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