wpf - How do I trap keyboard input from a Popup control -

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i wanting receive keyboard input popup control acts root visual touch screen keyboard control. i'm wanting control support keyboard input touch screen input. hook events (previewkeydown , keydown) , never fired.

a popup not focusable default , if focusable, have have else focusable on popup , focused or give focus in order receive keyboard event.

in other words, if want keyboard event popup use focusable="true" , put focusable control textbox or button or listbox , either let user give focus clicking on or manually use focus() code. if these things previewkeydown should fire popup.

here little demonstration program toggle button opens popup , shows slider increasing whenever previewkeydown event on popup:

<grid>     <stackpanel>         <slider name="slider1"/>         <togglebutton x:name="togglebutton1"                        content="open popup"/>     </stackpanel>     <popup placementtarget="{binding elementname=togglebutton1}"             isopen="{binding ischecked, elementname=togglebutton1, mode=oneway}"             focusable="true">         <i:interaction.triggers>             <i:eventtrigger eventname="previewkeydown">                 <ei:changepropertyaction targetobject="{binding elementname=slider1}"                                           propertyname="value"                                           value="1"                                           increment="true"/>             </i:eventtrigger>         </i:interaction.triggers>         <textbox background="white"                   focusable="true">             <textbox.text>sample popup content.</textbox.text>         </textbox>     </popup> </grid>

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