Initializing a control in a UserControl

hi, user control has property, currentcompound, contains value need display in hyperlink. however, when check value of property during user control constructor value null. how can properties value , use in content of hyperlink?

my code below.

the code invoked : <users:userctrl currentcompound="compound1" />

i have noticed @ line 24 property currentcompound empty , @ line 40 value contain correct string, since callback method static cannot access hyperlink's content property.

1      public string currentcompound
2            {
3                get
4                {
5                    return (string)getvalue(currentcompoundproperty);
6                }
7                set
8                {
9                    setvalue(currentcompoundproperty, value);
10                   this.hypercmpdbtn.content = value;
11               }
12           }
13   
14           public static dependencyproperty currentcompoundproperty =
15               dependencyproperty.register("currentcompound", typeof(string), typeof(compoundcontrol),
16                                       new propertymetadata("", currentcompound_propertychangedcallback));
17   
18           private string identifier { get; set; }
19   
20           public compoundcontrol()
21           {
22               initializecomponent();
23               identifier = generateid();          // create unique id instance of control
24               string x = this.currentcompound;
25           }
26   
27          
28           private void hypercmpdbtn_click(object sender, routedeventargs e)
29           {
30               darttable dt = darttable.instance;
31               dt.userselectedcompound = currentcompound;
32              // jump compound detail page
33               system.windows.browser.htmlpage.window.navigate(new uri(constants.page_compound_module_link, urikind.relativeorabsolute));
34           }
35   
36   
37           //  called when currentcompound changed via xaml exposed property
38            private static void currentcompound_propertychangedcallback(dependencyobject d, dependencypropertychangedeventargs e)
39           {
40               var value = e.newvalue as string;
41           }

 the xaml contains hyperlinkbutton control:

< hyperlinkbutton name="hypercmdbtn" />

you can replace "this" first parameter in method, direct object.

(d as customobject).hypercmpdbtn.content = value;

 

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