wpf listbox and datatemplate with grid inside -

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i have following question. want have listbox datatemplate grid. grid has 2 two columns. want set first column width 3* , *. how this? copy code.

<listbox x:name="commandlistbox" grid.row="1" grid.column="0" grid.columnspan="2" horizontalalignment="stretch">     <listbox.itemtemplate>         <datatemplate>             <grid>                 <grid.columndefinitions>                     <columndefinition width="3*" />                     <columndefinition width="*" />                 </grid.columndefinitions>                  <textblock grid.column="0" text="{binding}"/>                 <textblock grid.column="1" text="icon" />            </grid>         </datatemplate>     </listbox.itemtemplate>                 </listbox>

better store template in resources:

<window.resources>   <datatemplate x:key="defaulttemplate">     <grid x:name="griditem" width="200">        <grid.columndefinitions>            <columndefinition width="auto" />            <columndefinition width="auto" />        </grid.columndefinitions>         <textblock x:name="parameter" grid.column="1" text="{binding path=name}" margin="5,1,0,0" />        <textblock x:name="value" grid.column="2" text="{binding path=age}" margin="85,1,0,0" />         <line x:name="separator" x1="0" x2="0" y1="0" y2="20" snapstodevicepixels="true" grid.column="1" stroke="black" strokethickness="2" margin="50,0,0,0" horizontalalignment="left" />    </grid>  </datatemplate> </window.resources>

listbox define:

<listbox name="mylistbox" itemtemplate="{staticresource defaulttemplate}" />

in code c#:

public class person {   public string name   {     get;     set;   }   public int age  {    get;    set;  } }

define observablecollection:

private observablecollection<person> mylistboxdata = new observablecollection<person>();

and add items on collection:

mylistboxdata.add(new person() {   name = "nick",   age = 21, });  mylistboxdata.add(new person() {   name = "adam",   age = 11, });  mylistbox.itemssource = mylistboxdata;

edited:

then set width="3*", width="*" , margin="-widthgrid" of first textblock: 

<grid x:name="griditem" width="300">  <grid.columndefinitions>   <columndefinition width="3*" />   <columndefinition width="*" />  </grid.columndefinitions>   <textblock x:name="parameter" grid.column="1" text="{binding path=name}" margin="-220,0,0,0" />  <textblock x:name="value" grid.column="2" text="{binding path=age}" margin="0,0,0,0" /> </grid>

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