constructor - Construction of generic type parameter in Haxe -

i'm trying instantiate class based on function type parameter.
although documentation says possible, can't make work.

consider following code:

// dialog base class // every dialog in application derive class dialog {     public function new()     {         // stuff here     } }  // 1 of possible dialogs in application // extends dialog class testdialog extends dialog {     public function new()     {         super();         // more stuff     } }  // simple class tries instantiate specialized dialog, testdialog  class someappclass {     public function new()      {         var instance = create(testdialog);     }      @:generic     function create<t:dialog>(type:class<t>):t     {         return new t();     } } 

this doesn't work following error:
create.t not have constructor

clearly, i'm doing wrong, what?

specialdialog have different constructor dialog. have constraint it , constraint dialog.

code @ try haxe

package;   typedef constructible = {   public function new():void; }   // dialog base class // every dialog in application derive class dialog {     public function new()     {         trace("dialog");     } }   class superdialog extends dialog {     public function new()     {         super();         trace("super dialog");     } }  // simple class tries instantiate specialized dialog, testdialog   class someappclass {     public function new()      {         var dialog = create(dialog);         var superdialog = create(superdialog);     }      @:generic     public static function create<t:(constructible,dialog)>(type:class<t>):t     {         return new t();     } }  class test {   static public function main() {     new someappclass();   } }