c# - WPF DataTrigger - own enum return null in XAML -

i have code:

.xaml:

<datatrigger binding="{binding path=typeitem}" value="{x:static local:clistboxitem+etypeitem.file}">     ... </datatrigger> 

.cs:

public clistboxitem(etypeitem _type) {     this.typeitem = _type;     initializecomponent(); }  ...  public enum etypeitem { file,  directory }  ...  public static readonly dependencyproperty typeitemproperty =         dependencyproperty.register("typeitem", typeof(etypeitem), typeof(clistboxitem), new propertymetadata(etypeitem.directory)); public etypeitem typeitem {     { return (etypeitem) getvalue(typeitemproperty); }     set { setvalue(typeitemproperty, value); } } 

when run app style don't work. when use:

<datatrigger binding="{binding path=typeitem}" value="{x:null}">     ... </datatrigger> 

then work.. how make typeitem load own style?

if clistboxitem class derived listboxitem or control try trigger instead of datatrigger (and static value value="{x:static local:clistboxitem+etypeitem.file}"). datatrigger search property in datacontext , not in object itself.