c# - When extending treeview, do I need to specify a control template or does it use the default control template -

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starting make custom treeview , wondering why can't seem display. didn't change xaml except replacing treeview multiselecttreeview, yet doesn't display. if extend treeview, extended class inherit default control template of parent class?

public class multiselecttreeview:treeview   {     #region data members      private treeviewitem lastitem = null;      private observablecollection<treeviewitem> selectedtreeviewitemslist = new observablecollection<treeviewitem>();     public observablecollection<treeviewitem> selectednodes     {             {         return selectedtreeviewitemslist;       }       private set       {          selectedtreeviewitemslist.clear();         selectedtreeviewitemslist = value;       }     }      public bool ctrldown     {             {         return keyboard.iskeydown(key.leftctrl) || keyboard.iskeydown(key.rightctrl);       }     }     public bool shiftdown     {             {         return keyboard.iskeydown(key.leftshift) || keyboard.iskeydown(key.rightshift);       }     }     #endregion data members       #region constructors         /// <summary>         /// static constructor defines key used find default theme style control         /// </summary>         static multiselecttreeview()         {           defaultstylekeyproperty.overridemetadata(                   typeof(multiselecttreeview), new frameworkpropertymetadata(typeof(multiselecttreeview)));         }         public multiselecttreeview()         {           this.selecteditemchanged += new routedpropertychangedeventhandler<object>(multiselecttreeview_selecteditemchanged);           this.background = brushes.blue;           this.foreground = brushes.yellow;         }

by default, use default style treeview, specified different defaultstylekey in static constructor:

      defaultstylekeyproperty.overridemetadata(               typeof(multiselecttreeview), new frameworkpropertymetadata(typeof(multiselecttreeview)));

if this, must create style {x:type multiselecttreeview} key.

if want default style, remove statement code.


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