C# WPF - ComboBox to also be a TextBox, for example: just like in office where users can choose Font Size or enter it -

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i allow users choose font size combobox, them able enter size there own, tried out property: "iseditable" (and changed true value) of combobox, when enter isn't in combobox items (for example: items are- 2,3,4;and entered- 6), shows me following message: "object reference not set instance of object".

next time post source code question.

    public partial class mainwindow : window     {         public class someitem         {             public int[] numbers { get; set; }             public string chosentext { get; set; }         }          private someitem item;          public mainwindow()         {             initializecomponent();             this.item = new someitem{numbers=new[]{7,8,10}, chosentext="10"};             this.teststackpanel.datacontext = item;         }          private void button_click(object sender, system.windows.routedeventargs e)         {             messagebox.show(item.chosentext);         }     }      <stackpanel verticalalignment="center" x:name="teststackpanel">         <combobox iseditable="true" width="100" itemssource="{binding numbers}" text="{binding chosentext}"/>         <button content="selected value" margin="0,10,0,0" width="100" click="button_click"/>     </stackpanel>

i suggest issue in combobox.text property.


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