c# - how to put cursor focus on textbox? -

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i have wpf usercontrol contains controls , want put focus on textbox tried use "focusmanager.focusedelement" can't type in bacause tab set first control in usercontrol.

enter image description here

<grid>         <grid.rowdefinitions>             <rowdefinition height="10"/>             <rowdefinition height="45"/>             <rowdefinition height="160"/>             <rowdefinition height="50"/>             <rowdefinition height="15"/>             <rowdefinition height="272*"/>         </grid.rowdefinitions>          <button grid.row="1" x:name="btncreationoffre" background="transparent" width ="120" height="35" borderbrush="{x:null}" horizontalalignment="left"  click="btncreationoffre_click" margin="0,2,0,8" style="{dynamicresource nv_offrebutton}"/>         <button grid.row="1" x:name="btnmodifieroffre" background="transparent" width ="120" height="35" borderbrush="{x:null}" horizontalalignment="left" click="btnmodifieroffre_click" margin="130,2,0,8" style="{dynamicresource modifierbutton}" />         <button grid.row="1" x:name="btnconsulteroffre" width ="120" height="35" content="consulter" horizontalalignment="left" click="btnconsulteroffre_click" margin="260,2,0,8" style="{dynamicresource consulterbutton}" />         <button grid.row="1" x:name="btnsuppoffre" background="transparent" width ="120" height="35" borderbrush="{x:null}" horizontalalignment="left" click="btnsuppoffre_click" margin="390,2,0,8" style="{dynamicresource suppbutton}" />         <rectangle horizontalalignment="stretch" fill="gray" height="2" grid.row="1" verticalalignment="bottom" grid.columnspan="4" />          <grid x:name="gridfocus" grid.row="2" grid.columnspan="4">              <textblock grid.row="0" grid.column="1" horizontalalignment="left" verticalalignment="center">numéro offre</textblock>             <textbox x:name="textboxnumoffre" height="30" grid.row="0" grid.column="2" horizontalalignment="stretch" verticalalignment="center" />

what want when open usercontrol can type in textboxshown above named "textboxnumoffre"

try adding method (in xaml.cs) gets called when usercontrol gets loaded:

public yourusercontrol() {     initializecomponent();     this.dispatcher.begininvoke((action)delegate     {         keyboard.focus(textboxnumoffre);     }, dispatcherpriority.render); }

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